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Many studies have contrasted the diet of Cooper's and sharp-shinned hawk in other areas as well, with the sharp-shinned hawk much more regularly selecting birds weighing under about 28 g (0.99 oz), a fair amount overlap in birds of 28 to 40 g (0.99 to 1.41 oz) and 40 to 75 g (1.4 to 2.6 oz) weight classes but birds over this weight range are ...
This image has been assessed under the valued image criteria and is considered the most valued image on Commons within the scope Accipiter cooperii (Cooper's hawk) (juvenile). See its nomination here .
Left to right: Cooper's hawk, sharp-shinned hawk, and the red-tailed hawk (not to scale). In the United States, chickenhawk or chicken hawk is an unofficial designation for three species of North American hawks in the family Accipitridae: Cooper's hawk (also called a quail hawk), the sharp-shinned hawk, and the Buteo species red-tailed hawk.
"The hawk is a magnificent bird, soaring up on the warm air currents and rising above to gain a perspective over the whole landscape," he describes. ... Cooper's hawks teach us speed and stealth ...
Hawks, including the accipitrines, are believed to have vision several times sharper than humans, in part because of the great number of photoreceptor cells in their retinas (up to 1,000,000 per square mm, against 200,000 for humans), a very high number of nerves connecting the receptors to the brain, and an indented fovea, which magnifies the ...
Kestrels occasionally nest in holes created by large woodpeckers, [50] or use the abandoned nests of other birds, such as red-tailed hawks, merlins, and crows. [51] They have been recorded nesting on cliff ledges and building tops, as well as in abandoned cavities in cactuses. [52] [40] American kestrels also commonly utilize nesting boxes. [53]
Sharp-shinned hawk: F U F F Cooper's hawk: F U F F Red-shouldered hawk: U U F F Red-tailed hawk: C F C C Ferruginous hawk - - - U Golden eagle: U U U U American kestrel: U U F F Merlin - - U U Peregrine falcon: U - U U Wild turkey: U U U U California quail: C C C C Virginia rail: U U F F Sora: U - F F Common gallinule - - - U American coot: C F ...
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