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Zygodactylous

Zygodactylous

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Woodpeckers in general are highly adapted for feeding on insects hidden beneath the bark of trees.

Zygodactylous feet (two toes pointing backwards instead of one, as in many other birds) enable them to securely grasp a vertical surface..

Source: http://www.mydesert.com/article/20100801/COLUMNS08/7310338/-1/lifestylesfront/Woodpecker+likes+mountain+trees
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