- Bird - Wikipedia
Birds are a group of warm-blooded vertebrates constituting the class Aves, 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
- 10 MOST Common Birds Found in Seattle, WA (2025) - Bird Watching HQ
Below, you will learn the TEN most common birds that are found around Seattle! #1 Mallard Identifying Characteristics: Males have a bright green head, thin white collar, dark reddish-brown chest, yellow bill, and a black butt with a white-tipped tail Females are mottled brown with orange and brown bills
- Guide to North American Birds | Audubon
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
Detailed information for more than 600 North American bird species, including ID help, browse by shape and taxonomy, and deeper articles
- Bird | Description, Species, Feathers, Facts | Britannica
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
- BirdWeb
Browse By: Birds Accounts of Washington's bird species with images, maps, and sounds Birding Sites and Ecoregions Washington's ecoregions and favorite birding sites in each
- eBird - Discover a new world of birding. . .
eBird transforms your bird sightings into science and conservation Plan trips, find birds, track your lists, explore range maps and bird migration—all free
- Bird Pictures Facts - National Geographic
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 worldwide
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