Sanz hands us each a surgical mask—to protect the chimp, not us. "Talk about maladaptive behavior," Morgan whispers, with a chuckle. We back off a bit and spend the next several hours with our ...

Only identified as a species separate from chimps in 1929, bonobos intrigue biologists with their easygoing ways, sexual equality, female bonding, and zeal for recreational sex. How did bonobos ...

“Chimps have definitely drawn the PR short straw by comparison to bonobos,” says Matilda Brindle at the University of Oxford. The chimps use sex in a way that goes beyond reproduction and ...