From an article by E.B. Bartels for Wellesley Magazine that features Jill Greenberg’s photography:
Unlike many sciences, primatology has been dominated by women for decades. Studying nonhuman primates gained high visibility in the 1960s because of the “Trimates”—three young women paleoanthropologist Louis Leakey chose to study animals in the wild. Jane Goodall’s observations of chimpanzees, Dian Fossey’s research on gorillas, and Biruté Galdikas’s work with orangutans became a global sensation. Young girls learned about “Leakey’s Angels” and pictured themselves in the field, observing monkeys and apes.