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.
Bird | Description, Species, Feathers, & Facts | Britannica
网页5 天之前 · 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 are found...
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.
Search, All About Birds, Cornell Lab of Ornithology
网页Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles.
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.
Birds of the World - Cornell Lab of Ornithology
网页Dr. Birds of the World is a powerful resource that brings deep, scholarly content from four celebrated works of ornithology into a single platform where biologists and birders can find comprehensive life history information on birds. Every bird has a story. Discover them all with Birds of the World.
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 ...
Bird Guide Browse by Shape - All About Birds
网页Browse North American birds by shape—helpful if you don’t know exactly which type of bird you’ve seen.