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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.
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 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. About Birds of the World; Team; Subscribe
Explore más de 800 especies de aves de América del Norte, aprenda sobre sus vidas y hábitats, y cómo el cambio climático está afectando su capacidad para sobrevivir.
Identifica las aves que ves y escuchas con Merlin Bird ID. Guía de aves del mundo, gratis, con fotos, sonidos, mapas y más.
Hace 1 día · 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.
Science and Innovation. 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 continental scales. Explore the map for Baltimore Oriole. Baltimore Oriole by Matthew Plante / Macaulay Library.
