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Nearctic: Eastern North America from Minnesota, Ontario, and New
Brunswick south to northeastern Texas and Georgia.
Physical Characteristics
Mass, 7 to 8 ounces; Length, 7 to 10 inches; wingspan, 18 to 24 inches. Dichromatic; in gray phase, brownish gray dappled; in red phase pattern the same but the main color is chestnut-red. Their coloring helps them blend in almost perfectly with the bark on trees. Ear-tufts, large and conspicuous as well as very uncommon; four or five outer primaries notched or cut away on inner webs; toes scantily feathered toward their tips. Both colors, red and gray, have yellow eyes as well as a yellow beak.
Natural History
Food Habits
Otus asio feeds on large evening active insects like moths and katydids. It also eats amphibians, reptiles, small mammals like mice and tiny bats, small birds, and even small terrestrial invertebrates such as worms.
Reproduction
Sexual reproduction with internal fertilization. Otus asio females lay 4 to 5 eggs that are incubated 26 to 28 days. The babies are able to fly in about 4 weeks.
Behavior
This bird practices monogamy; the male and female mate for life. The birds are not migratory and often times a pair may keep the same nest, in winter and summer, until they are driven away. Unlike most other birds, the nests used by O. asio are quite filthy.
Habitat
These birds live usually in the tops of trees. They generally live in the hollowed out areas of the tree or in the old nests of other birds, because they do not make nests of their own.
