Asian Koel

The Asian koel is a large, long-tailed cuckoo measuring 39 to 46cm and weighing 190 to 327g. Like many of its relatives it is a brood parasite, laying its eggs in the nests of crows and other hosts, which raise its young (Wikipedia, general species account).

Males may distract the hosts so that the female gets a chance to lay an egg in the nest, and a female may remove a host egg before laying. The only source read for the Bhutan guide gives these details, with nothing on range, habitat or diet, so none is stated.