Chimpanzees aren't legally humans, a judge said. Brandon Wade/AP Images for The Humane Society of the United States and Chimp hide caption

itoggle caption Brandon Wade/AP Images for The Humane Society of the United States and Chimp

Mineral supplements, ape-style: A female chimp called Kana eats clay in the Budongo Forest of Uganda. A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands hide caption

itoggle caption A.Schel/Budongo Conservation Field Station/Animal Ecology, Utrecht University, The Netherlands

A juvenile chimpanzee uses a leaf sponge to drink palm wine in Bossou, Guinea. Gaku Ohashi/Chubu University, Japan, and Wildlife Research Center, Kyoto University, Japan hide caption

itoggle caption Gaku Ohashi/Chubu University, Japan, and Wildlife Research Center, Kyoto University, Japan

Should chimps have the same legal rights as these lawyers? Steven Wise, president of the Nonhuman Rights Foundation, who is representing research chimps Hercules and Leo, says yes. Assistant Attorney General Christopher Coulston disagrees. They both made their arguments Wednesday in Manhattan State Supreme Court in New York. Richard Drew/AP hide caption

itoggle caption Richard Drew/AP

Star enjoys a moment in the sun at the Chimp Haven sanctuary in Keithville, La. Brandon Wade/AP Images for The Humane Society of the United States and Chimp Haven hide caption

itoggle caption Brandon Wade/AP Images for The Humane Society of the United States and Chimp Haven