Birds are warm-blooded vertebrates comprising the class Aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5.5 cm (2.2 in) bee hummingbird to the 2.8 m (9 ft 2 in) ostrich. They are commonly used for food, as pets, for sport (e.g., falconry and hunting), and for scientific study. Their droppings can also be used as fertilizer.
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