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Great Horned Owl: Large owl with dark brown, gray-brown mottled upperparts and dark barred underparts. Head has distinct ear tufts and rufous facial disk. Throat and upper breast are white and may have dark spots. Northern birds are paler and grayer. Strong, silent, direct, flap and glide flight.
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Eastern Screech-Owl Gray Morph: Small with gray-mottled upperparts, rows of white spots at shoulders, heavily streaked and barred underparts. Facial disk is lightly mottled with prominent dark rim. Small ear tufts. Yellow eyes, bill is yellow or olive-green. Short, rounded wings and tail are barred.
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Western Screech-Owl: Small owl (kennicotti), distinct ear tufts, brown- or gray-mottled upperparts, white shoulder spots, streaked, barred underparts. Lightly mottled facial disk, has prominent dark rim. Yellow eyes, dark gray bill. Until recently considered the same species as Eastern Screech-Owl.
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Flammulated Owl: Small owl with two color morphs (gray-brown and rufous) with many intermediate forms. The head has very small ear tufts, and dark eyes surrounded by rust-brown, pale-gray facial disk, and white eyebrows that start at the bill. It is the only small owl with dark, not yellow, eyes.
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Boreal Owl: Medium owl, white-spotted, brown upperparts and thick brown-streaked, white underparts. Head is black with numerous small white spots, facial disks bordered with black, eyes are yellow-orange. Short flights have rapid wingbeats, longer ones are bouyant with shallow, silent wing beats.
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