Raptors are formally classified into five families and include birds--such as eagles, ospreys, kites, true hawks, buzzards, harriers, vultures, and falcons--that are familiar and recognized by many observers. These diurnal birds of prey are found on every continent except Antarctica and can thrive in seemingly inhospitable spots such as deserts and the tundra. They have powerful talons and hooked beaks for cutting and tearing meat, and keen...