The animals that were used for entertainment in the Colosseum what zoo they kept in?

Animals that were used for entertainment in the Colosseum were not kept in a zoo, though there was a section of the Colosseum that acted as a temporary holding center for animals before events. There were some permanent animal enclosures such as the Vivariums, which were structures similar to modern-day zoos that held animals used in hunts or other events, along with temporary facilities built near amphitheaters specifically to house animals. However, the animals were brought to these facilities on an ad hoc basis for specific events and were not kept there permanently.