For years the rocky north-facing slope of Hawk Mountain in eastern Pennsylvania attracted scores of hunters who would shoot hawks, falcons, and eagles out of the sky. In 1934, Maurice Broun came to Hawk Mountain to establish the world's first sanctuary for birds of prey. Today, the mountain's famous lookout attracts thousands of birders, nature-lovers, and scientists to marvel at the river of raptors that annually comes streaming by. The story of how Hawk Mountain went from hunting hotspot to a thriving research centre with an important role in raptor conservation is told in vivid prose.