The Resplendent Quetzal was first described by Mexican naturalist Pablo de La Llave in 1832. It is one of five species of the genusPharomachrus known as quetzals. The term "quetzal" was originally used for just this species, but is now applied to all members of the genera Pharomachrus and Euptilotis. Two subspecies are recognised, P. m. mocinno and P. m. costaricensis. The epithet mocinno is Llave's Latinization of the name of the biologist J. M. Mociño, a mentor of his. (It is sometimes spelled mocino, but "ñ" was formerly spelled "nn" in Spanish, so the spelling with "nn" is justified and in any case now official. The word "quetzal" came from Nahuatl (Aztec), where quetzalli (from the root quetz = "stand") meant "tall upstanding plume" and then "quetzal tail feather"; from that Nahuatl quetzaltotōtl means "quetzal-feather bird" and thus "quetzal". This species is 36–40 cm (14–16 in) long, plus up to 65 cm (26 in) of tail streamer for the male, and weighs about 210 g (7 oz). It is the largest representative of the trogon order. The subspecies costaricensis is slightly smaller than the nominate race and has shorter narrower tail plumes. Resplendent Quetzals have a green body (showing iridescence from green-gold to blue-violet) and red breast. Their green upper tail coverts hide their tails and in breeding males are particularly splendid, being longer than the rest of the body. The primary wing coverts are also unusually long and give a fringed appearance. The male has a helmet-like crest. The bill, which is partly covered by green filamentous feathers, is yellow in mature males and black in females. The skin of the quetzal is very thin and easily torn, so it has evolved thick plumage to protect its skin. Like other members of the trogon family, it has large eyes that adapt easily to the dim light of its forest home. The "song" is a treble syllable described as kyow or like "a whimpering pup", often in pairs, which may be repeated monotonously. Resplendent Quetzals have other unmusical calls as well.
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