The Stygian Owl Is Known For Its Red Reflected Eyes, Which Are Frequently Associated With The Devil

The stygian owl (Asio stygius) is a medium-sized “typical owl” in subfamily Striginae. It is found in Mexico, parts of Central America, Cuba, Hispaniola, and 10 countries in South America.

The stygian owl is 38 to 46 cm (15 to 18 in) long and weighs about 400 to 675 g (14 to 24 oz). The sexes have similar very dark plumage. (The adjective “stygian” means “of, or relating to, the River Styx”, but is more widely applied to anything that is dark or dismal.) The face is blackish with a pale border and a whitish forehead, and the head has long dark feathers that project upward as “ears”.

The dark upperparts have buff streaks and bars; the underparts are a dingy buff with dark brown or blackish barring and streaks. The eye is shades of yellow, the bill blue-black to blackish, and the feet dark grayish or brownish pink. The subspecies are substantially alike, differing mostly in the shade of the upperparts’ streaks and somewhat in size.

Some authors merge A. s. lambi into A. s. robustus. Some extend the range of robustus to include the Colombian, Ecuadorian, and Venezuelan populations otherwise attributed to A. s. stygius. Some include A. s. noctipetens in A. s. siguapa. And some include the population in southeastern Brazil in A. s. barberoi instead of in A. s. stygius.

The stygian owl inhabits a wide variety of landscapes from sea level to 3,000 m (9,800 ft) of elevation. Most are fairly open rather than densely forested or purely grasslands. They include montane pine, pine-oak, and cloud forests, thorn scrub, cerrado, pine plantations, and even urban parks.

The stygian owl is wholly nocturnal. The largest part of its diet is birds, from very small ones to some as large as the 150 g (5.3 oz) lesser nothura (Nothura minor); it is thought that most birds are caught on their nightime roosts. The diet also includes bats (which are seldom preyed on by other owls), some other mammals, frogs, and insects. Also in contrast to other owls, rodents do not appear to be part of its diet.

The stygian owl’s breeding phenology is not well known. Its breeding seasons vary widely across its range. Males give a wing-clapping display in flight. It nests on the ground or in trees; in the latter it apparently reuses nests of other species. It lays two or three eggs.

The stygian owl’s song has been variously described as “a single deep, emphatic woof or wupf”, “a very low and loud hu or hu-hu”, and “a muffled hoot given singly: boo”. Females also give “a short, screamed rre-ehhr or mehrr” when calling to the male and also “a short catlike miah”

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