The Chalakudy River, coursing through the sanctuary, has been dammed at there places, creating vast reservoirs ideal for viewing wildlife and birds.
        Habitat types are very diverse and support a variety of wildlife types are very diverse and support a variety of wildlife. While deer, sambar and gaur largely inhabit the forest fringes, the lion-tailed macaque, king cobra, tiger, leopard, civet cat, pangolin, porcupine, jungle cat, cane turtle, and the Ceylon frogmouth roam freely in the interiors. The Parambikulam frog (Rana parambikulamana) is exclusive to the sanctuary. There are plenty of trekking options here. The tribals from the area are usually well-informed guides.