Birds are vertebrates, with a backbone and skeleton, although some of the bones are hollow to keep the bird light and aloft. Their forelimbs have the same bones as the human arm, but they are highly modified to form the structure for wings. Some of the bones in the wrist and fingers are fused together for extra strength.

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All birds lay eggs with hard, waterproof shells, which they create nests for. A nest may be just a scrape in the sand or an elaborate structure of twigs, leaves, and other gathered materials. Birds incubate their eggs until they hatch. The parents continue to care for their young, bringing food to the nest site as needed. The chicks of some bird species, like chickens, are already covered with down and can start finding their own food. They are called precocial. Other chicks, like robins, hatch with no feathers and are helpless, depending on their parents to feed them. They are called altricia

🕊Birds