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They have three toes forward and one back, which allows them to grip well. That tendon even has projections that mesh with groves in the tendon sheath to keep it in place, When birds perch, there is a tendon in their legs that gets pulled further, locking their toes tightly to the branch. Birds' "knees" bend backwards, so when they perch this tendon is pulled to its furthest extent over the back of the knee. This is not changed until the bird consciously "lifts his knees up" and releases the tension on this tendon. The bird can sleep on the tree because his weight pushes down on his knees and keeps that tendon tight. Convenient, otherwise a sleeping bird would make an easy meal for predators.
i got this from http://www.funtrivia.com/askft/Question52293.html the person who wrote it was kaylofgorons
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