- Flight: Birds are the only animals that can fly. They have evolved specialized wings that allow them to generate lift and thrust, and their bodies are streamlined to reduce drag.
- Migration: Many bird species migrate long distances each year to find food and more favorable climates. Some species, such as the Arctic tern, travel up to 11,000 miles each year.
- Song: Many birds produce complex and beautiful songs. These songs are used to communicate with other birds, and they can be a source of enjoyment for humans as well.
- Nesting: Birds build a wide variety of nests, from simple platforms to complex structures made of twigs, leaves, and other materials. Nests are used to protect eggs and young birds from the elements and from predators.
- Tool use: Some bird species use tools to obtain food or build nests. For example, woodpecker finches use sticks to pry insects out of trees, and crows use twigs to probe for food in crevices.
- Coloration: Birds have a wide range of coloration, from drab browns and grays to bright reds, blues, and greens. Their coloration can be used for camouflage, to attract mates, or to intimidate predators.
- Intelligence: Birds are intelligent creatures, and some species have been shown to be capable of solving complex problems and learning new behaviors.