Two male chimps in Fouts's laboratory, Loulis and Dar, routinely blame each other for noisy quarrels.

In July a male chimp jumped into the same moat and nearly drowned before being rescued by a zoo visitor.

(June 26, 2012 - Los Angeles Zoo, California) A baby chimpanzee was killed by an adult male chimp in front of visitors.

The first thing you see upon entering the gallery is a grouping of three male chimps, created with hyperrealist precision in silicon, fiberglass, bronze and yak hair.

In chimpanzee societies, male chimps try to control access to a small number of females, but not with complete success.

As the primatologist Frans de Waal has observed, male chimps "seem to live in a hierarchical world with replaceable coalition partners and a single permanent goal: power."

This is likely due to the chimp's fission-fusion society, with male chimps leaving groups and returning after extended periods of time.

The male chimp is asleep.

One day, I learned that one of the male chimps had been wounded by two other males and was dying.

"This is a big male chimp," she says, indicating her associate, "and I am a female chimp."