Bird - Wikipedia
Birds are a group of warm-blooded vertebrates constituting the class Aves (Latin: [ˈaveːs]), 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.
Bird | Description, Species, Feathers, & Facts | Britannica
2024年11月29日 · Bird, any of the more than 10,400 living species unique in having feathers, the major characteristic that distinguishes them from other animals. They are warm-blooded vertebrates more related to reptiles than mammals.
Online bird guide, bird ID help, life history, bird sounds from …
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
Guide to North American Birds | Audubon
Explore more than 800 North American bird species, learn about their lives and habitats, and how climate change is impacting their ability to survive.
Search, All About Birds, Cornell Lab of Ornithology
Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles.
Bird Pictures & Facts - National Geographic
Birds are vertebrate animals adapted for flight. Many can also run, jump, swim, and dive. Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide...
All About Birds | Birds, Cornell Lab of Ornithology
All About Birds is your free online guide to birds and bird watching. Explore in-depth species information, tips from the Lab’s experts, and inspirational v ...
Bird - Simple English Wikipedia, the free encyclopedia
Birds live all over the world. They range in size from the 5 cm (2 in) bee hummingbird to the 2.70 m (9 ft) ostrich. There are about ten thousand species of birds. More than half of these are passerines, or perching birds. Birds have wings. The wings develop differently in different species.
Get to Know These 20 Common Birds | Audubon
2018年1月31日 · Widespread, common, and conspicuous, these medium-size birds can be found in every state in the Lower 48, every Canadian province, and Alaska. They are easy to spot with their rusty orange bellies and gray backs.
What's That Bird? | Audubon
Have you ever seen a large, black bird fly by and wondered: Is that a crow or a raven? Do you have trouble telling the difference between a swallow and a swift ? Is that sound you’re hearing an owl or dove?
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