Definition of "hoatzin" [ho•at•zin]

• A crested brownish bird (Opisthocomus hoazin) of tropical South America whose young have claws on the first and second digits of the wings. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The idea that the hoatzin is not close to seriemas or turacos, but is in fact a member of a hitherto-overlooked metavian clade at the base of Neoaves is an exciting one, mostly because it would make this bird strongly convergent on the coronavian turacos."
• "Even if the hoatzin is not one of them, cuckoos are quite interesting."
• "More taxa, more characters: the hoatzin problem is still unresolved."