How is the thumb structure described in woolly monkeys regarding opposability?
Answer
Their thumbs are notably small and described as unopposable.
Woolly monkeys exhibit distinct adaptations in their grasping appendages. While their hands and feet are adapted for gripping branches, featuring long fingers and opposable big toes, their thumbs present a notable contrast. Specifically, their thumbs are characterized as being remarkably small and, critically, unopposable. This structural characteristic means they lack the full opposability seen in certain other primate groups, forcing them to rely on highly sensitive tactile fingertips, along with their feet and prehensile tail, for intricate tasks like sorting food items.
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