Dr. Jane Goodall has died. She was 91.

The renowned conservationist, who spent decades studying chimpanzees, “passed away due to natural causes” on Wednesday while in California for a speaking tour, a statement released by her institute shared via Instagram read.

“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 institute continued.

Goodall was most famously known for her research with chimpanzees, which began at the Gombe National Park in Tanzania when she was 26 years old in the 1960s.

She was appointed by Dr. Louis Leakey, a paleoanthropologist and archaeologist, to study the species in the park alongside fellow researchers Dian Fossey and Birute Galdikas, who studied go

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