12] birds have a tendon that run from their body to thier claws. it runs over their knees. when they fall asleep on a branch, their bodyweight pushes the bird's legs into the crouched position. the tendon is stretched and this pulls the claws into the gripping position [like one of those rods with a pincer at one end that you use to pick up litter]. in fact, the bird cannot let go until it 'stands up'. so birds can stay attached to a branch even when dead.
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12] birds have a tendon that
12] birds have a tendon that run from their body to thier claws. it runs over their knees. when they fall asleep on a branch, their bodyweight pushes the bird's legs into the crouched position. the tendon is stretched and this pulls the claws into the gripping position [like one of those rods with a pincer at one end that you use to pick up litter]. in fact, the bird cannot let go until it 'stands up'. so birds can stay attached to a branch even when dead.