British primatologist Jane Goodall, who transformed the study of chimpanzees and became one of the world’s most prominent wildlife advocates, has died at the age of 91, her institute announced Wednesday.

Goodall “passed away due to natural causes” while in California on a speaking tour of the United States, the Jane Goodall Institute said in a statement on social media.

“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 statement added.

Born on April 3, 1934, in London, Goodall’s fascination with animals began in early childhood, when her father gave her a stuffed toy chimpanzee that she kept for life. She was also captivated by the Tarzan books, about a boy raised by apes who f

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