Natasha, a five-year-old macaque at the Safari Park, near Tel Aviv, now walks exlcusively on her hind legs.
She almost died of a severe stomach flu but suddenly stabilised and was released from the zoo's clinic.
Workers at the zoo say that's when she started walking upright exclusively, reports CBC News.
Monkeys usually alternate between upright walking and moving on all fours.
A zoo veterinarian says he's not sure why she has altered her behaviour but says the illness could have caused brain damage.
Other than walking upright, the vet says Natasha's behaviour has returned to normal.
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