British primatologist and anthropologist Dr. Jane Goodall, whose groundbreaking research led to a better understanding of chimpanzees in the wild, has died at age 91, according to the Jane Goodall Institute.

Details about a cause of death were not immediately available.

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Goodall, who was scheduled to speak Friday at UCLA Royce Hall, is best known for a decades-long study of wild chimpanzees in Tanzania. She is considered the world's top expert on the animals and their complex social structures.

Goodall was 26 when she traveled to Tanzania from England to conduct the study.

Goodall also was a vocal advocate for animals and the environment.

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