Chimpanzee

The great ape personhood movement aims to extend legal personhood to apes, a distinction that recognizes these non-human animals as beings with the capacity to hold both rights and duties.

• By Giovanni Ortolani

Chimpanzees and children as young as six will pay to see offenders punished, suggesting justice-seeking behavior in humans has deep evolutionary roots.

• By Kate Wheeling

Meet your favorite primate.

• By Ryan O'Hanlon