A young monkey at an Israeli zoo has started walking on its hind legs only, like humans, after a near death experience. Natasha, a 5-year-old black macaque at the Safari Park near Tel Aviv, was diagnosed with severe stomach flu with three other monkeys and slipped into critical condition two weeks ago. CRIENGLISH.com reported Thursday. After intensive treatment, her condition stabilized. But to everyone's surprise, when she was released from the clinic, she began walking upright like a human. Her veterinarian says the only possible explanation is that the monkey suffered brain damage from the illness.