Hoatzins

Part of speech: noun

Definitions

1. A species of bird native to the Amazon and Orinoco river basins known for its distinctive clawed wings and a unique digestive system that allows it to feed on leaves
2. This bird exhibits unusual physical traits, such as the ability to climb with its claws and a diet primarily consisting of foliage, making it notable among avian species
3. Often recognized for its odd appearance and herbivorous diet, this tropical bird also demonstrates unique behavior, including unusual vocalizations and a preference for living in small, social groups

Etymology: "Hoatzins" is the plural of "hoatzin", a bird of the Amazon and Orinoco basins whose name comes from Nahuatl, the language of the Aztecs. The Nahuatl "huāctzin" probably referred to a different bird altogether, so the name seems to have been transferred to this South American species from a bird that was never quite the same creature. The bird itself is an odd one. Young hoatzins have claws on the first two digits of their wings, which they use to scramble through foliage, and they digest their leaf-heavy diet by fermentation in an enlarged crop, much like a cow's rumen. Its name thus carries an echo of an older, looser naming habit, where a word for one bird could drift onto another.