Eagles (2.4 m). Eagles spend much of their time perching on trees or rocky crags or soaring at great heights. Eagles generally feed on small mammals and birds, usually caught by pouncing from a height. The golden and bald eagles also eat carrion, although the latter is mainly a fish eater. Sea eagles and African fish eagles are fish eaters, the snake and harrier eagles eat mainly reptiles, and the black eagles rob other birds of their eggs.