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 The bill of a domestic goose |
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The beak - otherwise known as the bill - is the only device a bird has for consuming food. Birds have no teeth so they must swallow their food whole. A bird's beak can vary in size and shape depending on the nature of their diet. Some birds such as the falcons have evolved to have a cutting type beak which allows them to tear through flesh, whereas the hummingbird has a probe like beak which allows them to drink the nectar from certain flowers. The beak is composed of an upper jaw called the maxilla, and the lower jaw called a mandible (Gilbertson, 1999).
Bird beaks are useful in otherways, e.g. woodcutters use theirs to cut wood, parrots have sharp swivelled beaks to tear fruits. Flamingoes have long beaks to pull out fish from the water and ducks have flat beaks that allow them to retain all the fish and plants while draining out the water.
References
- Gilbertson, Lance; Zoology Lab Manuel; McGraw Hill Companies, New York; ISBN 0-07-237716-X (fourth edition, 1999)
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