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The hallux or big toe is the biological name for digit I. In humans and non-human primates, the hallux is the largest toe on the foot.
The human big toe has limited grasping ability. Chimpanzees and many other non-human primates, who lack opposable thumbs, have an opposable hallux.
In birds with a anisodactyl or heterodactyl feet, the hallux is opposed or directed backwards and allows for grasping and perching.
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