The eared quetzal (Euptilotis neoxenus), also known as the eared trogon, is a near passerine bird in the trogon family, Trogonidae. It is native to streamside pine-oak forests and canyons in the Sierra Madre Occidental of Mexico south to western Michoacán and southeasternmost Arizona in the United States. This range includes part of the Madrean Sky Islands region of southeastern Arizona, southwestern New Mexico, and northern Sonora.
The eared quetzal was described and illustrated in 1838 by the English ornithologist and bird artist John Gould in his book A Monograph of the Trogonidae, or Family of Trogons based on a specimen collected in Mexico. He coined the binomial name Trogon neoxenus.[2][3] In 1858, in the second edition of his book, Gould placed the species in its own genus Euptilotis to give the current binomial name Euptilotis neoxenus.[4] The eared quetzal is the only species placed in the genus.[5] The specific epithet combines the Ancient Greek neos meaning "new" with xenos meaning "stranger", "guest" or "visitor". The genus name Euptilotis combines the Ancient Greek eu meaning "good" with ptilon meaning "feather" and -ōtis meaning "-eared".[6] The species is monotypic: no subspecies are recognised.[5]
A molecular phylogenetic study published in 2005 found that the eared quetzal was sister to a clade containing members of the genus Pharomachrus.[7]
Body length is 33–36 cm (13–14 in). 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.
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).