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.

One of the pieces of evidence provided by the research is the footage of a very young female chimpanzee chewing on plants that she later applies to a wound on her mother's body. Just a year ago, a group of scientists confirmed that chimpanzees self-medicate.