Megascops

Screech owls are typical owls (Strigidae) belonging to the genus ''Megascops'' with 22 living species. For most of the 20th century, this genus was merged with the Old World scops owls in ''Otus'', but nowadays it is again considered separately based on a range of behavioral, biogeographical, morphological, and DNA sequence data.

Screech owls are restricted to the Americas. Some species formerly placed with them are now considered more distinct (see below for details).

Description

Similar to other owls, the screech owl females are larger than the males of their species. They have a compact size and shape. They are small and agile, and about 7 to 10 inches tall and have a wingspan around 18 to 24 inches. They have prominent, wide-set feather tufts with bright yellow/green eyes. They have different brownish hues with whitish, patterned underside. This coloration helps them get camouflage against the tree bark.

Ecology and behavior

Screech owls hunt from perches in semiopen landscapes. They prefer areas that contain old trees with hollows; these are home to their prey, which includes insects, reptiles, small mammals such as bats and mice, and small birds. Screech owls have a good sense of hearing, which helps them locate their prey in any habitat. They also possess well-developed raptorial claws and a curved bill, both of which are used for tearing their prey into pieces small enough to swallow easily. They usually carry their prey back to their nests, presumably to guard against the chance of losing their meal to a larger raptor.

Screech owls are primarily solitary. During the late winter breeding season, however, males make nests in cavities, sometimes reusing abandoned nests of other animals, to try to attract females. The females select their mate based on the quality of the cavity and the food located inside. During the incubation period, the male feeds the female. These birds are monogamous, with biparental care. The young of most screech owls are altricial to semialtricial.

Northern screech owls are found in eastern states, such as New Jersey and New York. The screech owls are named for their piercing calls. Their normal territorial call is not a hoot as with some owls, but a trill consisting of more than four individual calls per second given in rapid succession (although the sound does not resemble screeching or screaming). They also have a kind of "song" used in courtship, and as a duet, between members of a pair. Calls differ widely between species in type and pitch, and in the field are often the first indication of these birds' presence, as well as the most reliable means to distinguish between species. The distinctness of many species of screech owls was first realized when vastly differing calls of externally similar birds from adjacent regions were noted.

Recent research has identified highlighting possible health implications for humans and wildlife.

Evolution, taxonomy, and systematics

The genus ''Megascops'' was introduced by German naturalist Johann Jakob Kaup in 1848. The type species is the eastern screech owl (''Megascops asio''). The evolutionary relationships of the scops and screech owls are not entirely clear. What is certain is that they are very closely related; they may be considered sister lineages which fill essentially the same ecological niche in their allopatric ranges. A screech owl fossil from the Late Pliocene of Kansas (which is almost identical to eastern and western screech owls) indicates a longstanding presence of these birds in the Americas, while coeval