Jane Goodall, the British conservationist and researcher renowned for her work with chimpanzees, has died at age 91.

The Jane Goodall Institute confirmed her death on Instagram Wednesday, saying Goodall died of natural causes.

She had been in California where she was visiting as part of a speaking tour in the U.S.

"Dr. Goodall's discoveries as an ethologist transformed science, and she was a tireless advocate for the protection and restoration of the natural world," said the post.

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