noun
Refers to the cuckoo bird. Most commonly encountered in the idiom 閑古鳥が鳴く (kankodori ga naku), meaning 'to be deserted' or 'to have few customers', likening the quiet to a cuckoo's call echoing in an empty place.
閑古鳥はカッコウ科の鳥です。
The kankodori is a bird of the cuckoo family.
あの店はいつも閑古鳥が鳴いている。
That shop is always deserted.