Before revision: Thus, it was Louis Leakey who encouraged Jane Goodall, Dian Fossey, and Birutė Galdikas to study chimpanzees, gorillas, and orangutan socio-ecology and behavior.
After revision: Thus, it was Louis Leakey who encouraged Jane Goodall, Dian Fossey, and Birutė Galdikas to study chimpanzee, gorilla andorangutan socio-ecology and behavior.