Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. The study of birds is called ornithology.

Dec 2, 2025 · eBird transforms your bird sightings into science and conservation. Plan trips, find birds, track your lists, explore range maps and bird migration—all free.

Nov 29, 2025 · 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 …

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 noun [C] (CREATURE) Add to word list A1 a creature with feathers and wings, usually able to fly

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

不能飞的鸟包括 企鹅 、 鸵鸟 、 几维 (一种 新西兰 产的 无翼鸟)、以及绝种的 渡渡鸟。 当 人类 或其他的 哺乳动物 侵入到他们的栖息地时，这些不能飞的鸟类将更容易遭受 灭绝，例如大的 海 …

May 6, 2025 · With their populations constantly declining, 1,227 bird species were listed as threatened by BirdLife International and the IUCN in 2009. However, conservation efforts are …

The smallest is the two-inch-long bee hummingbird. Everything about the anatomy of a bird reflects its ability to fly. The wings, for example, are shaped to create lift.

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 …