Senegal's Chimps Use Spears and Offer Clues to Our Past

In the hot savannas of Senegal, a rare group of 35 wild chimpanzees are doing something remarkable: crafting spears to hunt, soaking in pools to beat the heat, and showing us how our own ancestors might have survived millions of years ago. After 25 years of groundbreaking research, scientists are uncovering behaviors that could help both chimps and humans adapt to our warming world.