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Besides coloration, the western screech owl is of almost exactly the same general appearance and size as the eastern. The only reliable distinguishing feature is the bill color, which is considerably darker (often a black-gray) in the western and olive-yellow in the eastern; their voices also differ.
Its distinct coloration, approximated in the southern whiskered screech owl (Megascops trichopsis mesamericanus), is thus likely the result of strong genetic drift. Additionally, a population of the tropical screech owl from northern Colombia has recently been proposed as the Santa Marta screech owl ( Megascops gilesi ) to the IOC .
The primary call is an accelerating series of short whistles at an increasing tempo or a short then long trill falling slightly at end. Other calls: barking and chuckling, similar to the eastern screech owl. [6] They also make a high pitched screech. The two primary songs for the Western Screech Owl are the bounce and double trill.
The foothill screech owl is 20 to 23 cm (7.9 to 9.1 in) long and weighs 91 to 128 g (3.2 to 4.5 oz). The subspecies are reddish brown to brown with paler bellies, and most have both a pale and a dark morph. The intensity of the reddish cast varies among the subspecies as do the amount and pattern of streaks and spots on the upperparts and ...
Description. The bearded screech owl is the smallest of its genus in North America. It is 16 to 20 cm (6.3 to 7.9 in) long; males weigh about 63 g (2.2 oz) and females 72 g (2.5 oz). In addition to being heavier, females have somewhat longer wings and tails, and in both sexes the wings extend past the tail. The species has two color morphs.
The Middle American screech owl is 20 to 23 cm (7.9 to 9.1 in) long and weighs 95 to 150 g (3.4 to 5.3 oz). It is dimorphic, with one morph overall grayish-brown and the other overall rufous. Unlike other owls of the same genus, it has feathered feet. The brown morph has a light brown facial disc with a thin dark border, thin white brows over ...
First, in 1848, the screech owls were split off as Megascops. The white-faced owls of Africa, with their huge eyes and striking facial coloration, were separated in Ptilopsis in 1851. In 1854, the highly apomorphic white-throated screech owl of the Andes was placed in the monotypic genus Macabra.
The white-throated screech owl is a large member of its genus. It is 20 to 26 cm (7.9 to 10.2 in) long and weighs 130 to 185 g (4.6 to 6.5 oz). It is overall dark plumaged, has a round head with very small ear tufts, and a longish tail. Adults of the nominate subspecies have a dark brown head and upperparts with small blackish, reddish, and ...