Characterization of Birds This is an Estonian website that tells about birds. Keep in mind some of the grammar on the website is different because different countries speak English differently than people in the United States. When you get to the website, click on "General Characterization" on the right side of the screen.
Classification of Birds This website by Animals of the World helps you understand more about birds.
All About Birds This Enchanted Learning website tells you more about mammals.
Birds This Kidport website tells you more about birds.