Jane Goodall , the celebrated primatologist and conservationist best known for her work studying the behavior of chimpanzees, died Wednesday, Oct. 1. She was 91.

The Jane Goodall Institute confirmed Goodall’s death in a statement . The organization said she died from “natural causes” while in California on a speaking tour. “Dr. Goodall’s discoveries as an ethologist revolutionized science, and she was a tireless advocate for the protection and restoration of our natural world.”

Goodall’s work observing primates at the Gombe Stream Chimpanzee Reserve in Tanzania during the 1960s yielded several major scientific discoveries. She observed the chimpanzees eating meat, engaging in ritualistic activities like rain dances, fighting and showing affection, and — maybe most significantly — usin

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