Jane Goodall, the renowned conservationist who shaped the world's knowledge of chimpanzees, has died at the age of 91, the institute she founded announced Wednesday.

The Jane Goodall Institute said she died of natural causes while on a speaking tour in California.

"Dr. Goodall's discoveries as an ethologist revolutionized science, and she was a tireless advocate for the protection and restoration of our natural world," the organization said in a statement.

Goodall started documenting the lives and habits of chimpanzees in Tanzania as a young woman in the 1960s — but her passion for animals began long before that, in childhood. She told CBS News she would spend hours in a tree at her home in Bournemouth, England, with library books, dreaming of Africa. "I'll go to Africa, live wi

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