Legendary chimpanzee researcher Jane Goodall has died, the conservation organization she founded announced on Oct. 1.

Goodall, 91, died due to natural causes while she was in California on a cross-country speaking tour, according to The Jane Goodall Institute.

The British ethologist – a scientist who studies animal behavior within their habitat – had no formal training when she embarked on a study of chimpanzees in what would become Gombe Stream National Park in Tanzania, Africa, in the early 1960s. She skyrocketed to fame thanks in part to a National Geographic documentary about her field work and used her science celebrity status to advance conservation efforts for chimpanzees and other endangered species through her eponymous foundation.

"Dr. Goodall’s discoveries as an ethologist

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