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Hawk
Sharp-shinned Hawk
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes

The term hawk can be used in several ways:

Immature Northern Goshawk with fresh kill
Hawk sighted in Toronto in front of the Fields Institute.

The common names of birds in various parts of the world often use hawk in the second sense. For example, the Osprey or "fish hawk"; or, in North America, the various Buteo species (e.g., the Red-tailed Hawk, B. jamaicensis).

In February 2005, the Canadian ornithologist Louis Lefebvre announced a method of measuring avian "IQ" in terms of their innovation in feeding habits.[1] Hawks were named among the most intelligent birds based on his scale.

Hawks are widely reputed to have visual acuity several times that of a normal human being. This is due to the many photoreceptors in the retina (up to 1,000,000 per square mm for Buteo, against 200,000 for humans), an exceptional number of nerves connecting these receptors to the brain, and an indented fovea, which magnifies the central portion of the visual field.[2][3]

References

  1. ^ EurekAlert! Public News List:Bird IQ test takes flight - Dr. Lefebvre's AAAS presentation - Feeding innovations and forebrain size in birds (Monday, February 21, 2005)Part of the symposium: Mind, Brain and Behavior
  2. ^ "Hawks" (HTML). Avianweb.com. http://www.avianweb.com/hawks.htm. Retrieved 2010-01-30. 
  3. ^ Kirschbaum, Kari. "Family Accipitridae" (HTML). AnimalDiversity Web. University of Michigan Museum of Zoology. http://animaldiversity.ummz.umich.edu/site/accounts/information/Accipitridae.html. Retrieved 2010-01-30. 

External links

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