anomaliped

from The Century Dictionary.

• Syndactylous; having the middle toe united to the exterior by three phalanges, and to the interior by one only. The kingfisher is an example.
• noun A syndactylous bird; a bird whose middle toe is united to the exterior by three phalanges, and to the interior by one only.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) One of a group of perching birds, having the middle toe more or less united to the outer and inner ones.
• adjective Having anomalous feet.