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 and ...

The ostrich can't fly. Instead it has long powerful legs ... What makes an animal a bird? Learn about the different characteristics that make an animal a bird in this video.

Here are just a few bird migration variations. Learn all about hummingbird migration ... cliffside nests when they are still ...