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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 ...
The International Ornithological Committee (IOC) recognizes these 265 species of Accipitriformes distributed among four families. Among them is the family Cathartidae (New World vultures) which the American Ornithological Society (AOS), the Clements taxonomy , and BirdLife International 's Handbook of the Birds of the World place in its own ...
Similarly, the very small south America tiny hawk and semicollared hawk were found to be only distantly related to species in Accipiter. They were moved to a newly erected genus Microspizias which together with Harpagus is placed in the subfamily Harpaginae.
Unlike some birds, but similar to other diurnal raptors, most hawk species are violet-sensitive but cannot perceive ultraviolet light. [11] Hawks also have relatively high visual acuity – the distance at which they can resolve an image – with red-tailed hawks reported to have 16.8 cycles per degree. [ 12 ]
The type species was later designated by the Irish zoologist Nicholas Vigors as Falco palumbarius Linnaeus, 1758, now considered as a junior synonym of Falco gentilis Linnaeus, 1758, the Eurasian goshawk. [2] [3] The name is from Latin astur, asturis meaning "hawk". [4] Species now placed in this genus were formerly assigned to the genus Accipiter.
Hawk in flight. With their broad wingspans and sharp talons, hawks are some of the most regal birds in the skies. But beyond their powerful physical qualities, hawks hold deep spiritual meaning ...
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 willow ptarmigan is the state bird of Alaska. The list of birds of Alaska includes every wild bird species recorded in the U.S. state of Alaska, based on the list published by the Alaska Checklist Committee. As of January 2022, there were 534 species on the official list. Of them, 55 are considered rare, 149 are casual, and 79 are accidental, all as defined below. Another 18 and a species ...