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Dorsal view. Caligo illioneus has a wingspan reaching about 12–15 centimetres (4.7–5.9 in). In this large owl butterfly the dorsal sides of the wings vary from light brilliant blue to purplish with dark brown edges, while the undersides have a highly cryptic dull brown color, with huge yellow-rimmed eyespots resembling to the eyes of an owl.
Long-eared owls are 19.5% of owls (or 197 total owls) recorded migrating through Cape May Point in fall (against a majority, 60.6%, being saw-whet owls), with 26.1% of the specimens from the species caught in the mist nets being adults. More than 90% of long-eared owls migrate between mid-October and late November, with the immatures migrating ...
Different species of owls produce different sounds; this distribution of calls aids owls in finding mates or announcing their presence to potential competitors, and also aids ornithologists and birders in locating these birds and distinguishing species. As noted above, their facial discs help owls to funnel the sound of prey to their ears.
The birds then congregate in massive flocks made up of several different species for migratory purposes. Some birds make use of teamwork while hunting. Predatory birds hunting in pairs have been observed using a "bait and switch" technique, whereby one bird will distract the prey while the other swoops in for the kill.
The great horned owl is the heaviest extant owl in Central and South America and is the second-heaviest owl in North America, after the closely related but very different-looking snowy owl. [ 7 ] [ 12 ] It is heavily built, with a barrel-shaped body, a large head, and broad wings. [ 12 ]
The spotted owl (Strix occidentalis) is a species of true owl. It is a resident species of old-growth forests in western North America, where it nests in tree hollows, old bird of prey nests, or rock crevices. Nests can be between 12 and 60 metres (39 and 197 ft) high and usually contain two eggs (though some contain as many as four).
The great grey owl (Strix nebulosa) (also great gray owl in American English) is a true owl, and is the world's largest species of owl by length. It is distributed across the Northern Hemisphere , and it is the only species in the genus Strix found in both Eastern and Western Hemispheres.
The western screech owl (Megascops kennicottii) is a small owl native to North and Central America, closely related to the eastern screech owl. The scientific name commemorates the American naturalist Robert Kennicott .