Formal or literary term for the lesser cuckoo (Cuculus poliocephalus). In everyday contexts, ホトトギス is the common name.
See also: ホトトギス
The lesser cuckoo migrates to Japan as a summer bird.
In classical literature, the call of the lesser cuckoo is often composed in poetry.
Borrowed from Chinese 杜鵑, a traditional name for the cuckoo. Japanese uses the Sino-Japanese reading とけん as a literary and ornithological name for the lesser cuckoo.