The bald eagle is the national bird of the United States and one of the largest birds in North America.

Bald eagles usually live near water, where they feed on fish and water birds.

Bald eagles don't display their characteristic all-white head and tail feathers until they are about six years old; until then, they are mostly brown.

Some birds of prey are adapted to life among humans. Where humans grow crops, large populations of rats and mice thrive and attract rodent-hunting barn owls. Each owl eats 300 to 400 rodents a year.

Barns and abandoned buildings provide the cavities and crevices where barn owls lay their eggs. They do not build nests.

A lucky bird watcher may see tundra swans in Kansas as they migrate during the spring and fall. Tundra swans breed during the short summers in the flat treeless plains north of the Arctic Circle in Alaska and Canada; they spend the winter in the western United States or in a narrow corridor along the coast from Maryland to North Carolina.

Tundra swans are one of the largest water birds in North America. They live about 15 years and tend to live in family groups, with mates chosen for life.