According to the passage, eagles …………

Eagles are large predatory birds that have been symbols of power, courage, and immortality since ancient times. There are more than 50 species of eagles, and they inhabit all major land regions except Antarctica and New Zealand. Although once abundant, some species of eagles are becoming rare and face extinction. One rare species is the bald eagle, the national emblem of the United States. The bald eagle, like other birds, has been harmed by the widespread use of pesticides that, when ingested, can weaken eggs.