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Bird. Birds are a group of warm-blooded vertebrates constituting the class Aves ( / ˈeɪviːz / ), 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.
One of our most popular birds, the Cardinal is the official state bird of no fewer than seven eastern states. Abundant in the Southeast, it has been extending its range northward for decades, and it now brightens winter days with its color and its whistled song as far north as southeastern Canada.
Jun 22, 2024 · The ostrich is the largest living bird and may stand 2.75 metres (9 feet) tall and weigh 150 kg (330 pounds). Some recently extinct birds were even larger: the largest moas of New Zealand and the elephant birds of Madagascar may have reached over 3 metres (10 feet) in height. North American bird migration.
Birds are found worldwide and in all habitats. The largest is the nine-foot-tall ostrich. The smallest is the two-inch-long bee hummingbird. Everything about the anatomy of a bird reflects its ...
Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles.
The Cornell Lab will send you updates about birds, birding, and opportunities to help bird conservation. Use our Bird Guide to identify birds, learn about the life history, listen to the sounds, and watch bird behavior on video--the most comprehensive guide to Nort.
