Bird Beaks - Why Are There So Many Different Shapes?

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.

Beaks of Passerines

1. Seed Eaters: Grosbeaks, finches - have short, thick bills that can crush hard seed
2. Foliage Gleaners: Warblers, orioles, vireos - have longer, thin bills that can reach farther to pick an insect off a leaf
3. Ground Probers: Starling - pointed, thin bill that goes into the ground easily
4. Flying Insect Eaters: Swallows, flycatchers, nighthawks - all have flat bills with a broad base, an insect-catching design.

Beaks of Raptors

Raptors such as hawks, falcons and accipiters have sharply hooked bills for tearing apart animal flesh.

Herons and Egrets

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.

Sandpipers

• Curlews - use their long, downcurved bills to reach deep into the water for mollusks and small crabs and to probe in the mud for worms and insects.
• Godwits & Dowitchers - with long, up-turned bills, are more exclusively probers, whose rapid head jabs in the mud give rise to comparison with sewing machines.

Brown Pelican - widens its lower mandible to enclose a fish, which is trapped when the upper mandible shuts.

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.

Along with bird beaks, learn about other bird characteristics.

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