Jill Pruetz

Not many animals will use lethal aggression towards those in their own species, but two groups do - humans, and chimpanzees.

Julie Lesnik

Iowa State University primatologist Jill Pruetz introduced the world to the spear-wielding Savannah chimpanzees of Senegal. She's just returned to Iowa from her summer in that country; and this hour, host Charity Nebbe talks with with her about her discoveries.

And later in the hour, an update on the Ape Cognition and Conservation Initiative in Des Moines, from the organization's president and staff scientist, Bill Hopkins.

World Bank Photo Collection / flickr

Jane Goodall is famous for her groundbreaking observation of wild chimpanzees; but for the last 30 years, she’s devoted most of her time to traveling the world, telling her stories, and trying to fan the flames of an environmental movement that could save her beloved chimpanzees and so many other species from extinction.

Eric Kilby

Increasingly recognized as "the next Jane Goodall" in primatology circles, Iowa State University primatologist Jill Pruetz brings incredible research and stories back to Iowa from Senegal in western Africa, where she studies the lives of savanna chimpanzees.

patries71 /flickr

Approximately a thousand chimpanzees are held in U.S. laboratories for experiments. This week the federal government announced a proposal to list captive chimpanzees as endangered, a move that would increase protections for them.  Today on River To River - two opposing views over whether this is a good idea and how it might affect advances in the field of medicine.