The United States is one of the earliest countries to select a national bird, and its national bird is the bald eagle. Similarly, each of the 50 U.S. states has its own state emblem, state flower, state tree, and state bird. The national bird, the bald eagle, appears in many state emblems. Some birds, like the robin, bluebird, mockingbird, and cardinal, have become the state birds of multiple states. niaolei.org.cn