In the spring of 1993, Benjamin Kilham, a naturalist who lives in the woodlands of New Hampshire, began raising a pair of orphaned wild black bears. The experience changed his life.

While spending thousands of hours with the cubs, Kilham discovered unknown facets of bear behavior that have radically revised our understanding of animal behavior. Now widely recognized for his contributions to wildlife science, Kilham reveals that bears are altruistic and cooperate with unrelated, even unknown individuals, while our closer relatives, the supposedly more highly evolved chimps, cooperate only within troops of recognizable members. Beyond the natural history, he introduces individual bears who become enthralling and memorable characters.