Chita, a female chimpanzee, peers from within her new enclosure at a zoo in Asuncion, Paraguay, Friday, May 2, 2014. Chita came to Paraguay from Argentina in 1972, with another chimp named Congo, and they have been caged since. The chimpanzees haven't reproduced despite being together for 44 years. Veterinarians say it could be due to the stress of being in captivity. (AP Photo/Jorge Saenz)
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