The ecology of the United States is considered a "megadiverse": about 17 000, species of plants. Vascular happened in the land of the United States and the adjacent Alaska and over 1 800, type of flowering plants found in Hawaii,This group has not found on the mainland. The United States is home to mammals than 400 species, birds, reptiles, and 750 Amphibian species and 500. Insects around 91 000 species, has been described.Bald eagle is the national bird. And the national animal of the United States of America and the enduring symbol of the nation itself.
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