What structural features of woodpeckers help them to feed on trees?

The woodpecker is a forest bird that feeds on trees. The woodpecker’s legs are short and very strong. The fingers are adapted to move along the tree trunk: two fingers are directed forward, two – backward, each of which has tenacious claws. The wedge-shaped tail is hard and resilient: when the woodpecker moves along the bark, it serves as a support for its body. The woodpecker’s beak is strong, straight, pointed at the end. The neck is short, not very flexible. Shaking its head, the woodpecker strikes the bark with its beak, hollows it. The woodpecker tongue is very long, thin, flexible and can protrude far out of the mouth. The tip of the tongue is set with small teeth directed backwards, and the saliva is very sticky. Gouging the bark, the woodpecker looks for insects, their larvae, pupae, which hide under it or in the wood. Having felt the larva with a thin tongue in the course of the bark, the woodpecker pricks it on the tip of the tongue, removes it and eats it.

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