McHumba, a 3-week-old female pygmy chimpanzee, relaxes in the arms of her mother, Lolita, at the World-Famous San Diego Zoo January 16, 2001 in San Diego, CA. (Photo courtesy of San Diego Zoo/Newsmakers)

A chimpanzee unwraps a present that was delivered by Santa Claus December 21, 2001 at the Lion Country Safari in West Palm Beach, Florida. The annual event of giving gifts to the chimps, which include stuffed animals, balls, and food that have been wrapped by volunteers, hopes to provide them with enrichment and entertainment during the holiday season. (Photo by Joe Raedle/Getty Images)

Vijay, a 15-day-old Bonobo, or pigmy chimpanzee, is held at the Cincinnati Zoo and Botanical Garden January 12, 2003 in Cincinnati, Ohio. (Photo by Mike Simons/Getty Images)

A baby Chimpanzee plays in its enclosure at Taronga Zoo July 14, 2006 in Sydney, Australia. (Photo by Ian Waldie/Getty Images)

Female Chimpanzee Fifi sits in her enclosure at Taronga Zoo on her 60th birthday May 21, 2007 in Sydney, Australia. Fifi is the oldest of the Zoo's chimp population, which consists of 19 individuals. (Photo by Ian Waldie/Getty Images)

A chimpanzee receives a Christmas treat at Taronga Zoo on December 20, 2007 in Sydney, Australia.Taronga Zoo celebrated Christmas early giving treats to the zoo's giraffes, Kodiak Bears, chimpanzees and lions providing a wonderful natural display for zoo visitors. (Photo by Lisa Maree Williams/Getty Images)

A young chimpanzee watches the media covering the welcome of a new female baby chimpanzee to Sydney's Taronga Zoo on March 4, 2008 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)

A new female baby chimpanzee is cradled by her mother Shiba as she is welcomed at Sydney's Taronga Zoo on March 4, 2008 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)

A chimpanzee at Edinburgh Zoo looks up at the new 5.65 million pound enclosure, the world's largest at 1500 square feet, which can hold up to 40 chimpanzees May 1, 2008 in Scotland. The new Budongo Trail has three living pods connected by tunnels designed to simulate the animal's natural habitat. The chimpanzees can play on the world's largest climbing frame and man-made structure for apes. (Photo by Jeff J Mitchell/Getty Images)

A Chimpanzee plays in it's new home at Taronga Zoo on December 2, 2009 in Sydney, Australia. (Photo by Cameron Spencer/Getty Images)