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heterodactylous
Also het·er·o·dac·tyl
[het-uh-roh-dak-tuh-luhs]
adjective
Ornithology.
- having the first and fourth toes directed backward, and the second and third forward, as in trogons. 
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Word History and Origins
Origin of heterodactylous1
First recorded in 1850–55; hetero- + -dactylous
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