zygodactyly

anatomy

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July 15, 2026

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Zygodactyly refers to a condition in which a bird's toes are arranged with two facing forward and two facing backward. This arrangement is particularly useful for climbing. Birds with zygodactyl feet are often found in orders such as Psittaciformes (parrots, lorikeets, cockatoos) and Piciformes (woodpeckers and allies). This specialized foot structure aids in grasping branches and provides stability while climbing or perching.1234

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cuckoo roller
…is also distinguished by its zygodactyl feet, with each foot having two forward-pointing and two backward-pointing toes. Males are iridescent green above and gray below; females are brown above with tan and black spots below.
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…is also distinguished by its zygodactyl feet, with each foot having two forward-pointing and two backward-pointing toes. Males are iridescent green above and gray below; females are brown above with tan and black spots below.
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cuckoo
Physical description
…forms) and the feet are zygodactyl; i.e., the outer toe is reversed, pointing backward. The bill is rather stout and somewhat downcurved.
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…forms) and the feet are zygodactyl; i.e., the outer toe is reversed, pointing backward. The bill is rather stout and somewhat downcurved.
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psittaciform
Feet
…backward; this arrangement is called zygodactyl, which literally means “yoke-toed” and refers to the occurrence of toes in pairs. Zygodactyly also occurs in woodpeckers and their allies (Piciformes), cuckoos (Cuculiformes), and some other birds. The proximal (upper) bone of a bird’s foot, the tarsometatarsus (commonly considered the lower leg), lies…
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…backward; this arrangement is called zygodactyl, which literally means “yoke-toed” and refers to the occurrence of toes in pairs. Zygodactyly also occurs in woodpeckers and their allies (Piciformes), cuckoos (Cuculiformes), and some other birds. The proximal (upper) bone of a bird’s foot, the tarsometatarsus (commonly considered the lower leg), lies…
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