ZYGODACTYL
zygodactyl
(adjective) (of bird feet) having the first and fourth toes directed backward the second and third forward
Source: WordNet® 3.1
Etymology
Adjective
zygodactyl (not comparable)
Having two toes pointing forward, and two pointing backward; zygodactylous.
Noun
zygodactyl (plural zygodactyls)
(ornithology) Any bird with toes of this kind, such as the parrot.
Source: Wiktionary
Zyg`o*dac"tyl, Zyg`o*dac"tyle, n. Etym: [See Zygodactylic.] (Zoöl.)
Definition: Any zygodactylous bird.
Source: Webster’s Unabridged Dictionary 1913 Edition