An Australian Zoo is back in business after it was locked down Thursday morning over a lion scare. Employees of the Taronga Zoo in Sydney arrived at work on Thursday to make a horrifying discovery: an enclosure that housed five dangerous lions was empty, zoo officials say. The lions were running around loose on zoo property. The zoo was locked down, police officers were summoned and “all persons on site were moved to safe zones,” Taronga officials say in a statement released later in the day. Fortunately, all five escapees were recaptured without incident, a police spokesman reveals. Exactly how the lions were caught has not been disclosed. An investigation is underway in hopes of determining how the jungle cats got out of their enclosure, zoo officials say. Is it wrong to keep animals in zoos, or are zoos doing a good thing by keeping some species from going extinct?