(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.

To help ensure the survival of endangered whooping cranes, Operation Migration maintains an artificial breeding program that prepares chicks for adulthood.

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