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How does a giant panda use its sixth-digit-like forefoot bone to handle bamboo?
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Grizzly bear in Jasper National Park, western Alberta, Canada.
The giant panda possesses an enlarged wrist bone that functions similarly to a thumb, providing the animal with significant dexterity. This structure is not a true digit but rather an adaptation that developed from a bone in the wrist, existing as an addition to the panda's five standard fingers.12
Pandas use this specialized "thumb" to handle food with precision, specifically to strip bamboo of its leaves, which are the primary staple of their diet. In addition to its role in feeding, this thumblike bone assists the mother in cuddling and positioning her infant against her body during the first few weeks of life.21