Dr. Jane Goodall, renowned chimpanzee researcher and animal advocate, has passed away.

The Jane Goodall Institute announced the 91-year-old’s death from natural causes in a statement on Wednesday.

“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 said, per NBC News.

Goodall was in California on a U.S. speaking tour when she passed away, the statement added.

Of course, Goodall gained fame for her work with chimpanzees. She founded the Jane Goodall Institute in 1977. According to the Institute, she “went into the forest to study the remarkable lives of chimpanzees—and she came out of the forest to save them.”

The foundation’s website states that Goodall created a new

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