Their talons are sharp and hooked and their feet are zygodactyl with a reversible fourth toe. |
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All the small zygodactyl or semizygodactyl forms, generally from Eocene deposits, are jumbled together in the family Zygodactylidae. |
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Leahy offers nontechnical yet pithy descriptions of birds, from albatross to wren, and definitions of terms, from aggression to zygodactyl. |
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