Which book is Jane Goodall's first major publication about her chimpanzee observations?

Jane Goodall's first major publication about her chimpanzee observations was In the Shadow of Man. Published in 1971, the book introduced a broad audience to her pioneering fieldwork at Gombe Stream in Tanzania.

Goodall began studying wild chimpanzees at Gombe in 1960, under the guidance of anthropologist Louis Leakey. Her observations challenged assumptions about animal intelligence, social behavior, and the boundary between humans and other animals. The book combines scientific findings with vivid accounts of individual chimpanzees, including David Greybeard and Flo.

The title is sometimes confused with Goodall's later works. Reason for Hope is a 1999 memoir and reflection on conservation, while Hope for Animals and Their World was published in 2009. The Chimpanzees of Gombe, published in 1986, is a more specialized scientific account of her research.