Heterodactyl

[hetərə'dæktɪl]

(adj.) (of bird feet) having the first and second toes directed backward the third and fourth forward .

Editor: Will--From WordNet

(a.) Heterodactylous.

(n.) One of the Heterodactylae.

Editor: Matt

adj. having the digits irregular or peculiar in size form or position.—Also Heterodac′tylous.

Editor: Pedro