Adult sailfin lizards, from the South Pacific, need very large cages with a large bathing pool. Up to a trio can be kept in a cage at least 8-foot by 4-foot by 6 foot. Running water is a necessity. Owning a sailfin lizard is not for beginners. They are nervous lizards that will run into their cage walls if they think there is danger. This can easily damage their snouts. Males can be aggressive toward each other, so keep only one male per cage. Sailfins are prone to respiratory infections so keep cage temperatures at 74 to 82 degrees Fahrenheit during the day and 72 F. at nights. A heated bathing pool is important.