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From Wikipedia, the free encyclopedia

Predate redirects here. The verb "predate" may mean "[have a] date earlier than": see wikt:predate.
A juvenile Red-tailed Hawk eating a California Vole
Meat-eater ants feeding on a cicada; some species can prey on individuals of far greater size, particularly when working cooperatively

In ecology, predation describes a biological interaction where a predator (an organism that is hunting) feeds on its prey, (the organism that is attacked).[1] Predators may or may not kill their prey prior to feeding on them, but the act of predation always results in the death of the prey, and is never to its benefit.[2] The other main category of consumption is detritivory, the consumption of dead organic material (detritus). It can at times be difficult to separate the two feeding behaviors[1], for example where parasitic species prey on a host organism and then lay their eggs on it for their offspring to feed on its decaying corpse. The key characteristic of predation however is the predator's direct impact on the prey population. On the other hand, detritivores simply eat what is available and have no direct impact on the "donor" organism(s).

Selective pressures imposed on one another has led to an evolutionary arms race between prey and predator, resulting in various antipredator adaptations.

The unifying theme in all classifications of predation is the predator lowering the fitness of its prey, or put another way, it reduces its prey's chances of survival, reproduction, or both. Ways of classifying predation surveyed here include grouping by trophic level or diet, by specialization, and by the nature of the predator's interaction with prey.


Functional classification

Classification of predators by the extent to which they feed on and interact with their prey is one way ecologists may wish to categorize the different types of predation. Instead of focusing on what they eat, this system classifies predators by the way in which they eat, and the general nature of the interaction between predator and prey species. Two factors are considered here: How close the predator and prey are physically (in the latter two cases the term prey may be replaced with host). Additionally, whether or not the prey are directly killed by the predator is considered, with the first and last cases involving certain death.

True predation

Lion and cub eating a Cape Buffalo

A true predator is one which kills and eats another organism. Whereas other types of predator all harm their prey in some way, this form results in their certain death. Predators may hunt actively for prey, or sit and wait for prey to approach within striking distance, as in ambush predators. Some predators kill large prey and dismember or chew it prior to eating it, such as a jaguar, while others may eat their (usually much smaller) prey whole, as does a bottlenose dolphin or any snake, or a duck or stork swallowing a frog. Some predation entails venom which subdues a prey creature before the predator ingests the prey by killing, which the box jellyfish does, or disabling it, found in the behavior of the cone shell. In some cases the venom, as in rattlesnakes and some spiders, contributes to the digestion of the prey item even before the predator begins eating. In other cases, the prey organism may die in the mouth or digestive system of the predator. Baleen whales, for example, eat millions of microscopic plankton at once, the prey being broken down well after entering the whale. Seed predation is another form of true predation, as seeds represent potential organisms. Predators of this classification need not eat prey entirely, for example some predators cannot digest bones, while others can. Some may merely eat only part of an organism, as in grazing (see below), but still consistently cause its direct death.


Grazing organisms may also kill their prey species, but this is seldom the case. While some herbivores like zooplankton live on unicellular phytoplankton and have no choice but to kill their prey, many only eat a small part of the plant. Grazing livestock may pull some grass out at the roots, but most is simply grazed upon, allowing the plant to regrow once again. Kelp is frequently grazed in subtidal kelp forests, but regrows at the base of the blade continuously to cope with browsing pressure. Animals may also be 'grazed' upon; female mosquitos land on hosts briefly to gain sufficient proteins for the development of their offspring. Starfish may be grazed on, being capable of regenerating lost arms.


Parasites can at times be difficult to distinguish from grazers. Their feeding behavior is similar in many ways, however they are noted for their close association with their host species. While a grazing species such as an elephant may travel many kilometers in a single day, grazing on many plants in the process, parasites form very close associations with their hosts, usually having only one or at most a few in their lifetime. This close living arrangement may be described by the term symbiosis, 'living together,' but unlike mutualism the association significantly reduces the fitness of the host. Parasitic organisms range from the macroscopic mistletoe, a parasitic plant, to microscopic internal parasites such as cholera. Some species however have more loose associations with their hosts. Lepidoptera (butterfly and moth) larvae may feed parasitically on only a single plant, or they may graze on several nearby plants. It is therefore wise to treat this classification system as a continuum rather than four isolated forms.


Parasitoids are organisms living in or on their host and feeding directly upon it, eventually leading to its death. They are much like parasites in their close symbiotic relationship with their host or hosts. Like the previous two classifications parasitoid predators do not kill their hosts instantly. However, unlike parasites, they are very similar to true predators in that the fate of their prey is quite inevitably death. A well known example of a parasitoids are the ichneumon wasps, solitary insects living a free life as an adult, then laying eggs on or in another species such as a caterpillar. Its larva(e) feed on the growing host causing it little harm at first, but soon devouring the internal organs until finally destroying the nervous system resulting in prey death. By this stage the young wasp(s) are developed sufficiently to move to the next stage in their life cycle. Though limited mainly to the insect order Hymenoptera, Diptera and Coleoptera parasitoids make up as much as 10% of all insect species.[3][4]

Degree of specialization

An opportunistic Alligator swims with a deer.

Among predators there is a large degree of specialization. Many predators specialize in hunting only one species of prey. Others are more opportunistic and will kill and eat almost anything (examples: humans, leopards, and dogs). The specialists are usually particularly well suited to capturing their preferred prey. The prey in turn, are often equally suited to escape that predator. This is called an evolutionary arms race and tends to keep the populations of both species in equilibrium. Some predators specialize in certain classes of prey, not just single species. Almost all will switch to other prey (with varying degrees of success) when the preferred target is extremely scarce, and they may also resort to scavenging or a herbivorous diet if possible.[citation needed]

Trophic level

Mantis eating a bee.

Predators are often another organism's prey, and likewise prey are often predators. Though blue jays prey on insects, they may in turn be prey for cats and snakes, which, in the latter's case, may themselves be the prey of hawks. One way of classifying predators is by trophic level. Organisms which feed on autotrophs, the producers of the trophic pyramid, are known as herbivores or primary consumers; those that feed on heterotrophs such as animals are known as secondary consumers. Secondary consumers are a type of carnivore, but there are also tertiary consumers eating these carnivores, quartary consumers eating them, and so forth. Because only a fraction of energy is passed on to the next level, this hierarchy of predation must end somewhere, and very seldom goes higher than five or six levels, and may go only as high as three trophic levels (for example, a lion that preys upon large herbivores such as wildebeest which in turn eat grasses). A predator at the top of any food chain (that is, one that is preyed upon by no organism) is called an apex predator; examples include the orca, sperm whale, anaconda, Komodo dragon, tiger, Lion, bald eagle, and Nile crocodile -- and even omnivorous humans and grizzly bears. An apex predator in one environment may not retain this position as a top predator if introduced to another habitat, such as a dog among alligators or a snapping turtle among jaguars; a predatory species introduced into an area where it faces no predators, such as a domestic cat or a pig in some insular environments, can become an apex predator by default.

Many organisms (of which humans are prime examples) eat from multiple levels of the food chain and thus make this classification problematic. A carnivore may eat both secondary and tertiary consumers, and its prey may itself be difficult to classify for similar reasons. Organisms showing both carnivory and herbivory are known as omnivores. Even such herbivores such as the giant panda may supplement their diet with meat. Scavenging of carrion provides a significant part of the diet of some of the most fearsome predators. Carnivorous plants would be very difficult to fit into this classification, producing their own food but also digesting anything that they may trap. Organisms which eat detritivores or parasites would also be difficult to classify by such a scheme.

Predation as competition

An alternative view offered by Richard Dawkins is of predation as a form of competition: the genes of both the predator and prey are competing for the body (or 'survival machine') of the prey organism.[5] This is best understood in the context of the gene centered view of evolution.

Ecological role

Predators may increase the biodiversity of communities by preventing a single species from becoming dominant. Such predators are known as keystone species and may have a profound influence on the balance of organisms in a particular ecosystem. Introduction or removal of this predator, or changes in its population density, can have drastic cascading effects on the equilibrium of many other populations in the ecosystem. For example, grazers of a grassland may prevent a single dominant species from taking over.[6]

The elimination of wolves from Yellowstone National Park had profound impacts on the trophic pyramid. Without predation, herbivores began to over-graze many woody brow species, affecting the area's plant populations. Additionally, wolves often kept animals from grazing in riparian areas, which protected beavers from having their food sources encroached upon. The removal of wolves had a direct effect on beaver populations, as their habitat became territory for grazing.[7] Furthermore, predation keeps hydrological features such as creeks and streams in normal working order. Increased browsing on willows lenr and conifers along Blacktail Creek due to a lack of predation resulted in channel incision because those species helped slow the water down and hold the soil in place.[7]

Adaptations and behavior

The act of predation can be broken down into a maximum of four stages: Detection of prey, attack, capture and finally consumption.[8] The relationship between predator and prey is one which is typically beneficial to the predator, and detrimental to the prey species. Sometimes, however, predation has indirect benefits to the prey species,[9] though the individuals preyed upon themselves do not benefit.[10] This means that, at each applicable stage, predator and prey species are in an evolutionary arms race to maximize their respective abilities to obtain food or avoid being eaten. This interaction has resulted in a vast array of adaptations in both groups.

Camouflage of the dead leaf mantis makes it less visible to both its predators and prey.

One adaptation helping both predators and prey avoid detection is camouflage, a form of crypsis where species have an appearance which helps them blend into the background. Camouflage consists of not only color, but also shape and pattern. The background upon which the organism is seen can be both its environment (e.g. the praying mantis to the right resembling dead leaves) other organisms (e.g. zebras' stripes blend in with each other in a herd, making it difficult for lions to focus on a single target). The more convincing camouflage is, the more likely it is that the organism will go unseen.

Mimicry in Automeris io.

Mimicry is a related phenomenon where an organism has a similar appearance to another species. One such example is the drone fly, which looks a lot like a bee, yet is completely harmless as it cannot sting at all. Another example of batesian mimicry is the io moth, (Automeris io), which has markings on its wings which resemble an owl's eyes. When an insectivorous predator disturbs the moth, it reveals its hind wings, temporarily startling the predator and giving it time to escape. Predators may also use mimicry to lure their prey, however. Female fireflies of the genus Photuris, for example, copy the light signals of other species, thereby attracting male fireflies which are then captured and eaten (see aggressive mimicry).[11]


A South China Tiger as the predator feeding on the blesbuck, the prey.

While successful predation results in a gain of energy, hunting invariably involves energetic costs as well. When hunger is not an issue, most predators will generally not seek to attack prey since the costs outweight the benefits. For instance, a large predatory fish like a shark that is well fed in an aquarium will typically ignore the smaller fish swimming around it (while the prey fish take advantage of the fact that the apex predator is apparently uninterested). Surplus killing represents a deviation from this type of behaviour. The treatment of consumption in terms of cost-benefit analysis is known as optimal foraging theory, and has been quite successful in the study of animal behavior. Costs and benefits are generally considered in energy gain per unit time, though other factors are also important, such as essential nutrients that have no caloric value but are necessary for survival and health.

Social Predation offers the possibility of predators to kill creatures larger than those that members of the species could overpower singly. Lions, hyenas, wolves, dholes, African wild dogs, and piranhas can kill large herbivores that single animals of the same species could never dispatch. Social predation allows some animals to organize hunts of creatures that would easily escape a single predator; thus chimpanzees can prey upon colobus monkeys, and harrier hawks can cut off all possible escapes for a doomed rabbit. Extreme specialization of roles is evident in some hunting that requires co-operation between predators of very different species: humans with the aid of falcons or dogs, or fishing with cormorants or dogs. Social predation is often very complex behavior, and not all social creatures (for example, domestic cats) perform it. Even without complex intelligence but instinct alone, some ant species can destroy much-larger creatures.

Size-selective predation involves predators preferring prey of a certain size. Large prey may prove troublesome for a predator, while small prey might prove hard to find and in any case provide less of a reward. This has led to a correlation between the size of predators and their prey.[12] Size may also act as a refuge for large prey, for example adult elephants are generally safe from predation by lions, but juveniles are vulnerable.[12]

It has been observed that well-fed predator animals in a lax captivity (for instance, pet or farm animals) will usually differentiate between putative prey animals who are familiar co-inhabitants in the same human area from wild ones outside the area. This interaction can range from peaceful coexistence to close companionship; motivation to ignore the predatory instinct may result from mutual advantage or fear of reprisal from human masters who have made clear that harming co-inhabitants will not be tolerated. Pet cats and pet mice, for example, may live together in the same human residence without incident as companions. Pet cats and pet dogs under human mastership often depend on each other for warmth, companionship, and even protection, particularly in rural areas.

Antipredator adaptations

Antipredator adaptations have evolved in prey populations due to the selective pressures of predation over long periods of time.


Predatory animals often use their usual methods of attacking prey to inflict or to threaten grievous injury to their own predators. The electric eel uses the same electrical current to kill prey and to defend itself against animals (anacondas, caimans, jaguars, egrets, cougars, giant otters, humans, and dogs) that ordinarily prey upon fish similar to an electric eel in size; the electric eel thus remains an apex predator in a predator-rich environment. Many non-predatory prey animals, such as a zebra, can give a strong kick that can maim or kill, while others charge with tusks or horns.

Mobbing behavior

Mobbing behavior occurs when members of a species drive away their predator by cooperatively attacking or harassing it. Most frequently seen in birds, mobbing is also seen in other social animals. For example, nesting gull colonies are widely seen to attack intruders, including humans.[8] Costs of mobbing behavior include the risk of engaging with predators, as well as energy expended in the process, but it can aid the survival of members of a species.

While mobbing has evolved independently in many species, it tends to be present only in those whose young are frequently preyed on, especially birds. It may complement cryptic behavior in the offspring themselves, such as camouflage and hiding. Mobbing calls may be made prior to or during engagement in harassment.

Mobbing can be an interspecies activity: it is common for birds to respond to mobbing calls of a different species. Many birds will show up at the sight of mobbing and watch and call, but not participate. It should also be noted that some species can be on both ends of a mobbing attack. Crows are frequently mobbed by smaller songbirds as they prey on eggs and young from these birds' nests, but these same crows will cooperate with smaller birds to drive away hawks or larger mammalian predators. On occasion, birds will mob animals that pose no threat.

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Thomson's Gazelles exhibit stotting behavior.

A Thomson's Gazelle seeing a predator approach may start to run away, but then slow down and stot. Stotting is jumping into the air with the legs straight and stiff, and the white rear fully visible. Stotting is maladaptive for outrunning predators; evidence suggests that stotting signals an unprofitable chase. For example, cheetahs abandon more hunts when the gazelle stots, and in the event they do give chase, they are far less likely to make a kill.[13]

Aposematism, where organisms are brightly colored as a warning to predators, is the antithesis of camouflage. Some organisms pose a threat to their predators—for example they may be poisonous, or able to harm them physically. Aposematic coloring involves bright, easily recognizable and unique colors and patterns. Upon being harmed (e.g. stung) by their prey, the appearance in such an organism will be remembered as something to avoid.

Terrain Fear Factor

The "terrain fear factor" is an idea which assesses the risks associated with predator/prey encounters. This idea suggests that prey will change their usual habits to adjust to the terrain and its effect on the species' predation. For example, a species may forage in a terrain with a lower predation risk as opposed to one with high predation risk.[14]

Population dynamics

It is fairly clear that predators tend to lower the survival and fecundity of their prey, but on a higher level of organization, populations of predator and prey species also interact. It is obvious that predators depend on prey for survival, and this is reflected in predator populations being affected by changes in prey populations. It is not so obvious, however, that predators affect prey populations. Eating a prey organism may simply make room for another if the prey population is approaching its carrying capacity.

The population dynamics of predator-prey interactions can be modelled using the Lotka–Volterra equations. These provide a mathematical model for the cycling of predator and prey populations.

Evolution of predation

Predation appears to have become a major selection pressure shortly before the Cambrian period—around 550 million years ago—as evidenced by the almost simultaneous development of calcification in animals and algae,[15] and predation-avoiding burrowing. However, predators had been grazing on micro-organisms since at least 1,000 million years ago.[16][16][17][18][19]

Humans and predation

As predators

In much of the world, humans are the largest, best-organized, most cunning, and most powerful predators. The closest rival to humans in those characteristics in most of the world, the dog, is far more likely a collaborator than a competitor or a menace.

Humans are omnivorous and clever exploiters of tools from snares, clubs, spears, fishing gear, firearms to boats and motor vehicles in hunting other animals. Humans even use other animals (dogs, cormorants, and falcons) in hunting or fishing and such non-predatory animals as horses, camels, and elephants in getting approaches to prey.

Humans have reshaped huge expanses of the world as ranges and farms for the raising of livestock, poultry, and fish to be eaten as meat.

As prey

A lone naked human is at a physical disadvantage to other comparable apex predators in areas such as speed, bone density, weight, and physical strength, and humans lack innate weaponry such as claws. Without crafted weapons, society, or cleverness, a lone human can easily be defeated by fit predatory animals, such as wild dogs, big cats and bears. There are even recorded instances of lone humans being preyed upon by large carnivores (see Man-eater). However humans are not solitary creatures; they are social animals with highly developed social behaviors. Further humans and their ancestors (such as Homo erectus) have been using stone tools and weapons for well over a million years. Anatomically modern humans have been apex predators since they first evolved, and many species of carnivorous megafauna actively avoid interacting with humans; the primary environmental competitor for a human is other humans.

In conservation

Predators are an important consideration in matters relating to conservation. Introduced predators may prove too much for populations which have not coevolved with them, leading to possible extinction. This will depend largely on how well the prey species can adapt to the new species, and whether or not the predator can turn to alternative food sources when prey populations fall to minimal levels. If a predator can use an alternative prey instead, it may shift its diet towards that species, while still eating the last remaining prey organisms. On the other hand the prey species may be able to survive if the predator has no alternative prey—in this case its population will necessarily crash following the decline in prey, allowing some small proportion of prey to survive. Introduction of an alternative prey may well lead to the extinction of prey, as this constraint is removed.

Predators are often the species endangered themselves, especially apex predators who are often in competition with humans. Competition for prey from other species could prove the end of a predator—if their ecological niche overlaps completely with that of another the competitive exclusion principle requires only one can survive. Loss of prey species may lead to coextinction of their predator. In addition, because predators are found in higher trophic levels, they are less abundant and much more vulnerable to extinction.

Biological pest control

Predators may be put to use in conservation efforts to control introduced species. Although the aim in this situation is to remove the introduced species entirely, keeping its abundance down is often the only possibility. Predators from its natural range may be introduced to control populations, though in some cases this has little effect, and may even cause unforeseen problems. Besides their use in conservation biology, predators are also important for controlling pests in agriculture. Natural predators are an environmentally friendly and sustainable way of reducing damage to crops, and are one alternative to the use of chemical agents such as pesticides.

See also


  1. ^ a b Begon, M., Townsend, C., Harper, J. (1996). Ecology: Individuals, populations and communities (Third edition). Blackwell Science, London. ISBN 086542845X, ISBN 0632038012, ISBN 0632043938.
  2. ^ Encyclopedia Britannica: "predation"
  3. ^ Godfray, H.C.J. (1994). Parasitoids: Behavioral and Evolutionary Ecology. Princeton University Press, Princeton. ISBN 0691033250, ISBN 0691000476. P. 20.
  4. ^ Feener, Jr., Donald H.; Brian V. Brown (January 1997). "Diptera as Parasitoids". Annual Review of Entomology 42: 73–97. doi:10.1146/annurev.ento.42.1.73. Retrieved 2009-03-04. 
  5. ^ Dawkins, R. (1976). The Selfish Gene. Oxford University Press. ISBN 0-19-286092-5.
  6. ^ Botkin, D. and E. Keller (2003). Enrivonmental Science: Earth as a living planet. John Wiley & Sons. ISBN 0-471-38914-5. P.2.
  7. ^ a b William J. Ripple and Robert L. Beschta. "Wolves and the Ecology of Fear: Can Predation Risk Structure Ecosystems?" 2004.
  8. ^ a b Alcock, J. (1998). Animal Behavior: An Evolutionary Approach (6th edition). Sunderland, Mass.: Sinauer Associates, Inc. ISBN 0-87893-009-4.
  9. ^ Bondavalli, C., and Ulanowicz, R.E. (1999). Unexpected effects of predators upon their prey: The case of the American alligator. Ecosystems, 2: 49–63.
  10. ^ Dawkins, R. (2004). The Ancestor's Tale. Boston: Houghton Mifflin. ISBN 0618005838.
  11. ^ Lloyd, J.E. (1965). Aggressive Mimicry in Photuris: Firefly Femmes Fatales. Science 149:653–654.
  12. ^ a b Molles, Manuel C., Jr. (2002). Ecology: Concepts and Applications (International Edition ed.). New York: The McGraw-Hill Companies, Inc. ISBN 0-07-112252-4. 
  13. ^ Caro, T. M. (1986). The functions of stotting in Thomson's gazelles: Some tests of the predictions. Animal Behaviour 34:663–684.
  14. ^ Ripple, William J., and Robert L. Beschta. "Wolves and the ecology of fear: Can predation risk structure ecosystems?" BioScience 54: 755–66.
  15. ^ Grant, S. W. F.; Knoll, A. H.; Germs, G. J. B. (1991). "Probable Calcified Metaphytes in the Latest Proterozoic Nama Group, Namibia: Origin, Diagenesis, and Implications". Journal of Paleontology (JSTOR) 65 (1): 1–18. 
  16. ^ a b Bengtson, S. (2002), "Origins and early evolution of predation", in Kowalewski, M., and Kelley, P.H. (Free full text), The fossil record of predation. The Paleontological Society Papers 8, The Paleontological Society, pp. 289–317,, retrieved 2007-12-01 
  17. ^ McNamara, K.J. (20 December 1996). "Dating the Origin of Animals". Science 274 (5295): 1993–1997. doi:10.1126/science.274.5295.1993f. Retrieved 2008-06-28. 
  18. ^ Awramik, S.M. (19 November 1971). "Precambrian columnar stromatolite diversity: Reflection of metazoan appearance" (abstract). Science 174 (4011): 825–827. doi:10.1126/science.174.4011.825. PMID 17759393. Retrieved 2007-12-01. 
  19. ^ Stanley (2008). "Predation defeats competition on the seafloor" (extract). Paleobiology 34: 1. doi:10.1666/07026.1. 

Further reading

  • Barbosa, P. and I. Castellanos (eds.) (2004). Ecology of predator-prey interactions. New York: Oxford University Press. ISBN 0195171209.
  • Curio, E. (1976). The ethology of predation. Berlin; New York: Springer-Verlag. ISBN 0387077200.

External links


Up to date as of January 14, 2010
(Redirected to Prey (novel) article)

From Wikiquote

Prey is a techno-thriller novel by Michael Crichton first published in hardback edition in November 2002 and as a paperback edition in November 2003 by Harper Collins. Like Jurassic Park, the novel serves as a cautionary tale about developments in science and technology; in this case, nanotechnology.

The book features relatively new advances in the computing/scientific community, such as artificial life, emergence (and by extension, complexity), genetic algorithms, and agent-based computing.


  • Things do not turn out the way you think they will.
  • They didn't understand what they were doing. I'm afraid that will be on the tombstone of the human race. I hope it's not. We might get lucky.
  • Julia's original email says, "We have nothing to lose." But in the end they lost everything — their company, their lives, everything. And the ironic thing is, the procedure worked. The swarm actually solved the problem they had set for it.

External Links

Wikipedia has an article about:

1911 encyclopedia

Up to date as of January 14, 2010

From LoveToKnow 1911

PREY (0. Fr. preie, mod. proie, Lat. praeda, booty, from prae and the root hed - seen in prehendere, prendere, to grasp), booty, spoil, plunder taken in war, by robbery, or other violent means; particularly the quarry, the animal killed for food by a carnivorous animal; a beast or bird of prey. A particular usage for that which is saved from any trial of strength or battle is familiar from the Bible (Jer. xxi. 9) "his life shall be unto him for a prey."

<< Lucien Anatole Prevost-Paradol

Priam >>

Strategy wiki

Up to date as of January 23, 2010

From StrategyWiki, the free strategy guide and walkthrough wiki

Box artwork for Prey.
Developer(s) Venom Games, Human Head Studios
Publisher(s) 2K Games, Spike
Release date(s)
Windows, Xbox 360
Mac OS
Genre(s) FPS
System(s) Xbox 360, Windows, Steam, Direct2Drive, Mac OS, GameTap
ESRB: Mature
Followed by Prey Invasion
Series Prey
This is the first game in the Prey series. For other games in the series see the Prey category.

Prey is a first-person shooter video game developed by Human Head Studios and produced by 3D Realms using a heavily modified version of the Doom 3 engine. Venom Games is responsible for the Xbox 360 port of the game.

A playable single and multiplayer demo of the game was released on June 22, 2006 for Windows, and a downloadable Xbox 360 demo was released on the Xbox Live Marketplace on June 30, 2006. The game went gold on June 28, 2006, and was released in North America on July 11, 2006 and on July 14, 2006 in Europe.

In October 2006, 3D Realms CEO Scott Miller announced that the game is a commercial success on both PC and Xbox 360 with combined 1 million copies sold worldwide to date.

On November 29, 2006 Aspyr Media announced a Mac port, with an anticipated release date in January 2007.

On November 30 2006, Prey was released on Steam for $49.95 US. Previous purchasers of both the retail or downloadable version are able to activate a copy using their existing CD key. Soon after, the price was lowered to $19.95 USD in North America and South America. All other countries retain the same price.


The story focuses on Domasi Tawodi (Cherokee) (a.k.a. Tommy), a Cherokee garage mechanic and former U.S. Army soldier living on a Native American reservation in Oklahoma. At the beginning of the game Tommy is in a bar owned by his girlfriend Jen. Domasi is tired of living on the reservation, and constantly tries to push his heritage away. At the same time he tries to convince Jen to leave home with him, if only for a short while, to which she refuses steadfastly. A series of unpredictable events leads Tommy on a path to save humanity and the bonds to his spiritual heritage.

Table of Contents

Getting Started
  • Controls
  • The Bar


Up to date as of February 01, 2010

From Wikia Gaming, your source for walkthroughs, games, guides, and more!


Developer(s) Human Head Studios
Publisher(s) 2K Games
Status In development
Release date 2006
Genre FPS
Mode(s) Single player
Age rating(s) ESRB: M
Platform(s) PC, Xbox 360
Media CD
Credits | Soundtrack | Codes | Walkthrough

PC game that was originally under development by 3D Realms from 1996 to 1997 featuring fully dynamic visible portals. The original was scrapped due to technical problems with lighting, however it is now under development by Human Head Studios on the Doom 3 engine. In keeping with the Biomechanoid theme of the Alien Sphere, most of Prey's weapons are also hybrids of both mechanical and living, organic parts.

Limited Collector's Edition

Prey also shipped in a Limited Collector's Edition for both PC and Xbox 360. The official retail price is US$60 for PC and US$70 for X360. The following comes in the package:

  • An embossed collector's tin
  • An upgrade to one DVD-ROM (as opposed to three CD-ROMs)
  • Two pewter figurines (Hunter and Tommy)
  • The Art of Prey booklet
  • A free soundtrack download from DirectSong


  • Wrench — Tommy's Pipe wrench, used as an improvised mêlée weapon. Holding primary fire swings it back and forth quickly, while holding secondary fire makes Tommy bring it above his head for a more powerful strike when released.
  • Rifle — An automatic weapon which fires bolts of energy at a medium rate. Secondary fire causes an appendage to emerge from the weapon and attach itself to Tommy's eyeball, augmenting his vision with a zoomed-in "scope" view. The zoom can be further magnified too. In this mode, creatures glow brightly when the targeting area passes over them, making them highly visible. Also, while zoomed, the Rifle fires only single shots which are much more powerful and use more ammo.
  • Crawler — Small, 3-legged crab-like creatures which are found roaming all over the Sphere. Can be used in two ways: by ripping off all of its legs and throwing the abdomen, it becomes like a grenade which explodes after a couple of seconds. Ripping off just one leg and throwing will make the crawler become like a proximity mine; attaching to whatever surface it lands on and exploding when a creature comes near. Pressing secondary fire makes Tommy flip the Crawler over to select which way to use it.
  • Leech Gun — A powerful and versatile weapon. Ammo is gained by using the secondary fire to draw energy from nodes found throughout the Sphere. Different nodes make the gun take on different properties:
    • Plasma (red glow): fires fast-moving balls of energy causing moderate damage;
    • Freeze (light-blue glow): short-range attack which turns enemies into ice;
    • Lightning (white sparks): fires a bolt of electricity — one or two shots kill most enemies, but "ammo" is more limited than with other types;
    • Sunbeam (orange glow): a violently incandescent beam which cuts down most enemies almost instantly, as well as pushing the player back while firing.
  • Auto Cannon — A rapid-fire, multi-barrel machine gun complemented with a secondary fire which lobs grenade-like orbs from an orifice above the gun barrels, exploding on impact. Continuous use of the primary fire will make the gun overheat and stop firing for a moment until it cools down again.
  • Acid Sprayer — Created by the friendly Hiders. A shotgun-style weapon which sprays acid rather than buckshot. The primary fire is deadly at close range, but much less effective at further distances. The secondary fire launches the entire vial of acid, which can be lethal if the shot hits its mark. Skillfully-aimed shots with the secondary fire can be rebounded against walls and around corners and so on.
  • Launcher — An RPG-type weapon with Crawlers used as the ammo (although this is not shared with the individual Crawlers that are used as hand grenades). Primary fire shoots in a straight line to the target, exploding and causing damage in a large radius. Secondary fire vaporizes the Crawler into a lingering cloud of acid, effectively creating a shield in front of Tommy which dissolves any projectiles that come into contact with it.
  • Spirit Bow — Tommy's only weapon while spirit walking. Its ghostly arrows are powerful and effective over a long range, but with a relatively slow firing rate. At certain points in the game, it has some special uses which cannot be done with any other weapon.
  • Talon — Tommy's spirit guide, appearing in the form of a translucent blue hawk. In addition to guiding the player through the levels, perching on controls that need to be activated, and translating most of the alien speech and text visible on screens, Talon will also attack any nearby enemies (glowing red as he does so), providing a useful distraction. However, Talon can not be controlled by the player other than to make it follow.

External Links

  • Mac Prey Demo
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Simple English

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