May 14 (UPI) -- New research sheds light on how chimpanzees self-medicate wounds with plants and provide aid to other chimps. A new report published Tuesday in the journal Frontiers in Ecology and Evolution provides fresh clues on the origin of human medical care and how primates -- such as chimps, orangutans and gorillas -- utilize natural resources as medicine in scores of ways to stay healthy. "Understanding the cognitive and social foundations of healthcare behaviors in humans requires