ajohn

Although Greater Coucals are related to cuckoos, they do not parasitise other birds. They build their own nest and take care of their own chicks, in the same way as most bird species. I think the nest is usually hidden well in dense vegetation and I have never seen a coucal nest.

Koels are true cuckoos and they do parasitise other birds (in Hong Kong, usually Black-collared Starling or Eurasian Magpie). They do not build a nest or look after their own chicks.