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

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

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

toggle 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

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

An example of a human precision grip — grasping a first metacarpal from the thumb of a specimen of Australopithecus africanus that's thought to be 2 to 3 million years old. T.L. Kivell & M. Skinner hide caption

toggle caption T.L. Kivell & M. Skinner

Maybe Early Humans Weren't The First To Get A Good Grip

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