Little is known about the social behaviour of this lizard (5). Females breed once a year, but can lay several clutches of eggs in a good season (4) (5). Each clutch typically contains two to eight eggs and is buried in a shallow hole dug into the soil close to the waterside (4) (5). Hatchlings emerge after about two months (5) and are soon active and agile, enabling them to escape the numerous predators that may be lurking nearby, including snakes, birds and fish (4). Like their parents, hatchlings are good swimmers and will readily seek refuge in the water to escape approaching danger (4).
The sail-fin lizard is omnivorous, feeding on a wide variety of plant material such as leaves, shoots, and fruit, and opportunistically supplementing its diet with the occasional insect or crustacean (4).