A mother chimp holds a piece of lettuce in her mouth as 

A mother chimp holds a piece of lettuce in her mouth as she carries her baby at Chimp Haven in Keithville, La., Tuesday, Feb. 19, 2013. One hundred and eleven chimpanzees will be coming from a south Louisiana laboratory to Chimp Haven, the national sanctuary for chimpanzees retired from federal research. (AP Photo/Gerald Herbert)
Associated Press
A mother chimp holds a piece of lettuce in her mouth as she carries her baby at Chimp Haven in Keithville, La., Tuesday, Feb. 19, 2013. One hundred and eleven chimpanzees will be coming from a south Louisiana laboratory to Chimp Haven, the national sanctuary for chimpanzees retired from federal research. (AP Photo/Gerald Herbert)
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