Bird - Wikipedia
网页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.
Guide to North American Birds | Audubon
网页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
网页Be a Better Birder: How to Identify Bird Songs. Think Like a Bird: Understanding Bird Behavior. Feeder Birds: Identification and Behavior. Be a Better Birder 1: Size and Shape. Be a Better Birder 2: Color and Pattern. Be a Better Birder: Sparrow Identification. Be a Better Birder: Warbler Identification. Be a Better Birder: Duck and Waterfowl ...
Bird | Description, Species, Feathers, & Facts | Britannica
网页2024年8月20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.
Bird Pictures & Facts - National Geographic
网页About Birds. 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 …
Birds of the World - Cornell Lab of Ornithology
网页Subscribe to Birds of the World. Unlock species accounts, maps, multimedia, and bird family overviews. Video description.
Online bird guide, bird ID help, life history, bird sounds from …
网页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.
eBird - Discover a new world of birding...
网页eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.
Cornell Lab of Ornithology—Home
网页The Cornell Lab is powered by science, technology, and millions of people around the globe—people like you. eBird Status and Trend Maps reveal how birds are faring across …
All About Birds - Birds, Cornell Lab of Ornithology
网页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 ...