Search Result for "heterodactyl foot":
Wordnet 3.0

NOUN (1)

1. a bird's foot having the first and second toes of each foot directed backward and the third and fourth forward; 



WordNet (r) 3.0 (2006):

heterodactyl foot
    n 1: a bird's foot having the first and second toes of each foot
         directed backward and the third and fourth forward [ant:
         zygodactyl foot]