Zygodactylous a. : Yoke-footed; having the toes disposed in pairs; -- applied to birds which have two toes before and two behind, as the parrot, cuckoo, woodpecker, etc.

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Taxonomy
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Defination from the web:
zygodactylous. Comparative. not comparable. Superlative. none (absolute) (ornithology) Having two toes pointing forward, and two toes pointing backward. ... Retrieved from "http://en.wiktionary.org/wiki/zygodactylous" ...