Anaivilundawa is a man made wetland constructed in the 12th Century AD and is located on the western migratory bird route, A Haven for birdlife. This is a sanctuary with prolific bird life in beautiful surroundings. The vegetation of the site consists of a scenic forest in the low country dry zone and in addition to birds, mammals such as mouse deer, hare, mongoose, squirrels, wild cats (such as civets), wild boar and fruit bats and reptiles and amphibians like land monitors, water monitors, lizards, geckoes, skinks, and tortoises can be sighted.
There are over 160 species of birds at this site. However, of special interest are species such as Spoonbills, Ibises, Darters, Harriers, species of Bee-eaters an Owls etc…