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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]
With a massive distributional gap consisting of most of South America, the rufous-tailed hawk is considered a separate species now, but the two hawks still form a "species pair" or superspecies, as they are clearly closely related. The rufous-tailed hawk, while comparatively little studied, is very similar to the red-tailed hawk, being about ...
Red-shouldered hawk taking flight at Green Cay Wetlands, Florida. Males are 38 to 58 cm (15 to 23 in) long and weigh on average 550 g (1.21 lb). Females are slightly larger at 47 to 61 cm (19 to 24 in) in length and a mean weight of 700 g (1.5 lb).
The ferruginous hawk (Buteo regalis) is a large bird of prey and belongs to the broad-winged buteo hawks.An old colloquial name is ferrugineous rough-leg, [2] due to its similarity to the closely related rough-legged hawk (B. lagopus).
The common nighthawk or bullbat (Chordeiles minor) is a medium-sized [3] [4] crepuscular or nocturnal bird [3] [5] of the Americas within the nightjar (Caprimulgidae) family, whose presence and identity are best revealed by its vocalization.
The lightest known species is the roadside hawk, [a] at an average of 269 g (9.5 oz) although the lesser known white-rumped and Ridgway's hawks are similarly small in average wingspan around 75 cm (30 in), and average length around 35 cm (14 in) in standard measurements.
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The species suffered heavy persecution by 18th-century European landowners and gamekeepers, but withstood attempts to eradicate it. For example, on the estate at Sandringham in Norfolk, 1,645 'hawks' were killed between 1938 and 1950, with 1,115 taken between 1919 and 1926 at Langwell and Sandside in Caithness, Scotland. [75]