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A rare set of western lowland gorilla twins--Kali (bottom left), a male, and Kazi, a female--with their mother, 22-year-old Kuchi, at Zoo Atlanta. The twins turned one year old today and are the only twins in a captive population to be entirely mother-reared. "The decision to allow Kuchi to raise both of her offspring was a difficult one and unprecedented," said Dr. Tara Stoinski, Zoo Atlanta manager of conservation partnerships. "But we decided to stick to our philosophy that mother-rearing is best. With this success we have established a new precedent for the management of gorilla offspring in zoos."