In describing Australia's twenty-four species of birds of prey, Olsen relates their complex biology to the continent's unique geography and ecology. She explains why species such as the Nankeen Kestrel and Brown Falcon can range widely from coastal cliffs and river valleys to arid grasslands and wooded hillsides. She describes why others, such as the Red Goshawk, Pacific Baza, and Brahminy Kite, have ranges dramatically limited by their dependence on particular habitats and types of prey.