our reporter, carl gierstofer, travelled to the "chimpanzee island" in lake victoria. ♪ carl: today'selivery, several tons of fruit and vegetables, is very welcome. some of these chimpanzees were rescued from traps set by poachers. others are orphans, left behind after their families were killed. the chimps stay in these cages only at night. in the morning, the day begins with one of three feeding sessions. waiting for breakfast can be a frustrating business. for some, mealtimes are a free-for-all. others rely on their ingenuity. but in the end, everyone's happy and well fed. ngamba island is a sanctuary for chimpanzees. the chimps who arrive here all have a traumatic history. survivor lost his mother. he had no one to socialize him or protect him from bullying by other chimps in the group. survivor was attacked by another male chimp, who bit him and broke his leg. >> i'm trying to palpate the area where the fracture was, where the bite was, and he's not feeling any pain. carl: but scars have been left behind, even if they're not visible. >> he became a bit more fearful. whenever he c