Subscribe | UPI Odd Newsletter Subscribe Jan. 28 (UPI) -- A chimpanzee at an Australian zoo escaped from its enclosure early Thursday morning, but it returned to the exhibit without any intervention, officials said. The Taronga Zoo in Sydney said a contractor doing work at the facility spotted the male chimpanzee sitting calmly outside of its enclosure at 5:47 a.m. Thursday and alerted officials. Advertisement The zoo's emergency response unit was activated, but ended up not being needed, as the chimp returned to its enclosure on its own a few minutes after it was seen by the contractor. "The chimp is safe and well and is being monitored by our specialist keepers and vets," the zoo said in a statement. Officials said the chimpanzee troop will remain off public display until conclusion of an investigation into how the primate managed to escape. Read More 'Lord of the Rings' plastic block diorama breaks Guinness record Lynx recaptured a week after Canadian zoo escape Man discovers $2M lottery jackpot hours after crashing car