Scientific Name of the Ceylon Frogmouth is Batrachostomus moniliger. Ceylon Frogmouth, also called Sri Lanka Frogmouth, is a scarce endemic resident in South India and Sri Lanka. The Frogmouths are a group of nocturnal birds mainly found in the tropical forests. The Ceylon Frogmouth is a highly adapted forest bird with froglike croaking call and shape of the head. At night, it hunts insects and beetles with its large gape.
Frogmouth is about 23 cm long. It looks large-headed, and has a large flattened hooked bill and huge frog-like gape. The female is rufous, lightly spotted with white. The male is grey and more heavily spotted. Frogmouths blend brilliantly with the surrounding of its day roosting perch, and roost everyday at the same location. The flight appears weak and fluttery.

Frogmouths build nests on woody climber, dense branches of trees or wooden platforms. They lay 1 or 2 white eggs, which both sexes incubate, usually the female by night, and the male by day. Frogmouths sleep horizontally or lengthwise on the branch of a tree with their heads up and eyes closed. While sleeping no one can easily identify or spot the bird because of its specific colour which perfectly matches with the colour of the surrounding. Frogmouth is best located at night by its song, which is a loud descending cackly and frog-like series of Klock-klock-klock-klock-klock calls. It has the quality of sound produced by rattling pebbles. This is the call of the male and it is often answered by the female whose call is low long harsh Krrshhhh.

Ceylon Frogmouth was first recorded by Dr. Salim Ali in 1930s in Thattekkad. Later it was rediscovered in circa 1990 by ornithologist Dr.R Sugathan, from the same sanctuary. Dr. R Sugathan the famous ornithologist and a student of Dr. Salim Ali. He is an ardent birder and best guide for South India.