Filmmaker Allison Argo shares some thoughts on the making of "Chimpanzees: An Unnatural History."

Filmmaker Allison Argo decided to make a film that would tell the stories of some of the chimps she had encountered, so their sacrifices would never be forgotten.

Meet some of the chimpanzees now living in chimp facilities featured in "Chimpanzees: An Unnatural History."

(Airs Sunday, June 20) While we are mesmerized by their likeness to our species and we have continually found uses for chimps, we never considered what they wanted or needed.

View additional Web and print resources for NATURE's "Chimpanzees: An Unnatural History."

NATURE interviewed Gloria Grow, the founder of Fauna Foundation, which cares for retired chimps.

Living a life of captivity leaves deep scars and identity crisis -- even in those chimps lucky enough to retire to a sanctuary like Fauna Foundation.

Sharing 99 percent of our DNA, chimps have been used in the study of infectious diseases, gene therapy, vaccine development, reproduction, and anatomy.

It turns out that chimps and humans have something else in common: the capacity to kill, and not just for food. Primatologist and Anthropologist David Watts discusses his research.