Saturday, November 12, 2011

Eastern Screech Owls

Though common throughout the eastern U.S. and Mexico, eastern screech owls are seldom encountered by the casual naturalist. However, like other nocturnal wildlife, they become more active and conspicuous during the colder months and may be seen early or late in the day; since they often inhabit residential areas, November through March is a good time to watch and listen for these small raptors.

Yellow-eyed and less than 10 inches from tail to ear tufts, eastern screech owls may be reddish brown or gray in color; the former are more common along the east coast while the latter dominate in western parts of their range. They roost and nest in abandoned woodpecker cavities or in man-made boxes (intended for flickers, wood ducks or for the screech owls themselves); there the female will lay 3-6 eggs in the spring, foregoing the use of nest materials.

Eastern screech owls are perhaps best known for their eerie call, a tremulous, descending whinny; they also deliver a monotone trill. Feasting primarily on large insects during the warmer months, these nocturnal hunters switch to a diet of mice and songbirds from late autumn to early spring. Newborn screech owls may fall prey to raccoons, snakes, crows and jays while adults are more often killed by great horned or barred owls.