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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.
El Banco Internacional de Reconstrucción y Desarrollo (BIRD) es la institución del Banco Mundial encargada de la financiación, asistencia y apoyo a las economías del Segundo Mundo o economías en proceso de desarrollo. El BIRD es una de las dos patas del Banco Mundial para la ayuda a los países menos desarrollados del planeta.
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
19 de may. de 2024 · 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. Learn more about birds in this article.
16 de jun. de 2021 · 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 ...
eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.
18 de ago. de 2015 · eBird: como empezar. Bienvenido a eBird! Ahora formas parte de una red mundial de observadores de aves, investigadores, y conservacionistas—unidos gracias a nuestro interés compartido con respecto a las aves y el mundo natural. Más de 200,000 personas han usado eBird, ingresando más de 260 millones de observaciones de aves de todos los ...
