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The eared quetzal (''Euptilotis neoxenus''), also known as the eared trogon, is a near passerine bird in the trogon family, Trogonidae. It breeds in streamside pine-oak forests and canyons in the Sierra Madre Occidental of Mexico south to western Michoacán. It is sometimes seen as a vagrant to southeasternmost Arizona in the United States and has bred there. This range includes part of the Madrean Sky Islands region of southeastern Arizona, southwestern New Mexico, and northern Sonora. It is a resident of the middle to upper levels of pine-oak woodlands and oak-conifer forests, frequently along streams. It nests high in an unlined shallow tree cavity, usually selecting an old woodpecker hole. Nests have been observed in pine, fir, maple, and aspen trees. Limited excavation of the cavity is accomplished using the bill to dig into the rotten wood of the walls and opening. Quetzals differ from typical New World trogons in having iridescent wing coverts, less extensive fusion between the two forward-facing toes of their heterodactyl foot, broad tails with distinctly convex (rather than straight or concave) sides, and eggs with pale blue shells. They also average larger in body size than typical trogons, and the eggs and young develop more slowly. The eared quetzal is a seemingly primitive form, lacking the impressively long iridescent upper tail and wing coverts of members of the genus ''Pharomachrus'' (including the resplendent quetzal). Body length is . Both sexes have iridescent green backs, iridescent dark blue central tail feathers, and outer tail feathers that are predominantly white terminally with a band of black at the base (sometimes partially barred black and white in females). The bill is dull gray with a slightly darker band at the tip. The adult male has a blackish head, iridescent green breast, and geranium red belly and undertail coverts. The adult female has a gray head, breast, and upper belly and less extensive (though equally bright) red on the lower belly. Both sexes bear the wispy hair-like auricular plumes that give the species its name, though these are rarely apparent in the field. Both head and bill appear rather small and narrow in comparison to those of typical trogons. The male's song (tremolo call) is a series of whistled notes increasing in volume. Calls include low-intensity squeals rising in pitch, a loud squeal ending with a sharp "chuck," and a strident cackle given mostly in flight. Eared quetzals feed on insects, small vertebrates, and fruit, including the warty red fruits of madrone trees. Caterpillars, moths, katydids, cicadas, small lizards, and other prey are fed to the young. Like other trogons, eared quetzals often pluck prey and fruit while hovering. Members of this species have been observed to exhibit aversion to large areas of conspicuous color on and near human observers (negative chromotropic responses), including white, red, orange, and blue.〔 This suggests that the species-confidence hypothesis,〔 which states that birds tend to be attracted to colors that match those found in their species and repelled by colors not found in their species, does not apply to eared quetzals. == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eared quetzal」の詳細全文を読む スポンサード リンク
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