Jane Goodall, the famed conservationist known for her expertise on chimpanzees and her globe-spanning advocacy of environmental causes, has died.

Goodall, a UN Messenger of Peace and Founder of the Jane Goodall Institute, was 91.

The Jane Goodall Institute confirmed the news on Instagram .

What we know:

The organization said she died of natural causes in California while on a speaking tour across the U.S.

She had been scheduled to meet with students and teachers on Wednesday to launch the planting of 5,000 trees around wildfire burn zones in the Los Angeles area. Organizers learned of her death as the event was set to begin at the EF Academy in Pasadena, California, said spokesperson Shawna Marino. The first tree was planted in Goodall’s name after a moment of silence.

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