Unawatuna has a diverse range of wildlife. Clive Byers, an ornithologist, has observed over sixty species of endemic birds in the area, including terns, egrets, herons, sandpipers, and kingfishers, as well as rarer species such as the lesser whistling duck, Asian palm swift, white-breasted waterhen, Loten’s sunbird, and black bittern. These birds are most commonly seen in the remaining marshy area and on Rumassala Hillock.