adjective Ornithology.
having the first and fourth toes directed backward, and the second and third forward, as in trogons.
Also, heterodactyl.

1850–55; hetero- + -dactylous

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World English Dictionary
heterodactyl (ˌhɛtərəʊˈdæktɪl)
1.  (of the feet of certain birds) having the first and second toes directed backwards and the third and fourth forwards
2.  a bird with heterodactyl feet

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