Jane Goodall, the British primatologist who studied chimpanzees for nearly 60 years and was considered one of the world’s foremost experts in the field, has died at age 91.

Her death was announced Wednesday by the Jane Goodall Institute. She died from natural causes in California.

“Dr. Goodall’s discoveries as an ethologist revolutionized science,” the institute said in a statement. “She was a tireless advocate for the protection and restoration of our natural world.”

Armed with little more than a notebook and binoculars, Goodall travelled from England to what is now Tanzania in July 1960 to study chimpanzees, according to the institute. Rather than observe from afar, she immersed herself in their habitat and lives, discovering chimpanzees engage in activities previously thought to be e

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