Here is something about the food habits of the Greater Coucal (Scientific name: Centropus sinensis): “…a wide range of insects, caterpillars and small vertebrates such as the Saw-scaled vipers. They are also known to eat bird eggs, nestlings, fruits and seeds. In Tamil Nadu they were found to feed predominantly on snails Helix vittata. They are also known to feed on the toxic fruits of Cascabela thevetia (Yellow Oleander). In Oil palm cultivation, they have been noted as an avian pest due to their habit of eating the fleshy mesocarps of the ripe fruits. (Wiki)
Clicked at Trivndrum in Dec/2014.