There are many different types of bird beaks or bills, but why?
Birds have evolved a great variety of bills or adapted to their varied food habits. All of them, however, arise in fundamentally the same way.
Bird beaks are essentially a compact layer of epidermal cells (horny sheath) molded around the bony core of each mandible, the upper and lower jaws.
In nearly all birds, unlike mammals, both upper and lower jaws can move.
Below are some examples of different kinds of bird beaks and their uses.
Raptors such as hawks, falcons and accipiters have sharply hooked bills for tearing apart animal flesh.
Wading birds like herons and egrets have long bills enable them to make sudden, long jabs into the water for fish, frogs, crayfish, and snakes.
Brown Pelican - Widens the lower mandible to enclose a fish in its pouch (like a fish net) upon diving, which is trapped when the upper mandible shuts.
When the pelican resurfaces, it points its bill down to drain the pouch, then points it up and back to swallow the fish.
American Woodcock - uses its long straight bill to get worms out of the ground. The tip of its upper mandible is flexible, and when underground can move away from the lower mandible and then close on a worm like tweezers.
Hummingbird bills are very specialized for extracting nectar from flowers.
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