Dr. Jane Goodall, the renowned conservationist and animal welfare advocate who became the world's foremost expert on chimpanzees after spending decades studying them in the wild in Tanzania's Gombe Stream National Park, has died. She was 91.

According to a statement on Wednesday, Oct. 1, from her eponymous institute, she died of natural causes while on a speaking tour in California.

She leaves behind her son, Hugo, and grandchildren.

"Dr. Goodall’s discoveries as an ethologist revolutionized science, and she was a tireless advocate for the protection and restoration of our natural world,” her institute said.

It was Goodall's trailblazing research on the personalities and social interactions of the chimpanzees she so closely studied that changed the way we view our connection to the

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