- Birds are bipedal animals, which means they have two feet and can stand, walk, and run.
- There are about 10,000 living species making them the most numerous vertebrates and they inhabit ecosystems all over the world including the Arctic and Antarctica. Many of the species migrate long distances.
- They are warm-blooded animals that can lay eggs. These eggs are usually laid in a nest and are incubated by the parents.
- Most birds take care of their young for an extended length of time after hatching.
- Birds have feathers and a beak with no teeth.
- Birds have a very lightweight but strong skeleton.
- Birds have forelimbs that are covered with feathers and are called wings. The wings and lightweight skeleton allows them to fly.
- Birds range in size from the 2 inch Bee Hummingbird to the Ostrich which can grow to 9 feet tall.
- Birds are also social animals which participate in social behaviors. They are known to work together in breeding, flocking, hunting and mobbing predators that threaten them.
- They communicate using songs and calls. They can also communicate by using visual signals, such as quickly flapping their wings.
- About 120–130 species have become extinct since the 17th century, and hundreds more before then.
- The extinction of many species of birds is blamed on human activity.
- There are currently about 1,200 species of birds are threatened with extinction, though efforts are underway to protect them.
Bird Identification Guide
Bird Photo Gallery
Birding: Wild Birds
Birds of America
Birds of North America
Birds of the Week
Eggs: A Virtual Exhibition
Electronic Zoo: Bird Sites
Field Guide to Birds
Guide to Birds and Bird Watching
Introduction to the Aves – The Birds
Kaytee Discovery Zone
Life of Birds
National Audubon Society
National Geographic – Birds
Nature Sound Studio
Official U.S. State Birds
Wild Birds: 21st Century
WildWatch cam: Eagle Cam