Voice
Highly vocal, calling by day and night from a perch and in flight. A far-carrying frenetic, shrill 'ju-ichi', beggining weakly but accelerating and becoming stronger and higher pitched 'ju-ichi ju-ichi ju-ichi'.
Rufous Hawk-Cuckoo (Hierococcyx hyperythrus) [XC617617]
by Peter Boesman from Yoshida Trail Mount Fuji, Japan (song)
Rufous Hawk-Cuckoo (Hierococcyx hyperythrus) [XC371156]
by \u5c0f\u83dc\u9e1f from Kanagawa Prefecture (near \u014ciso-machi), Kanagawa-ken, Japan (song)
Nest
None. Egg(s) laid in that of the foster parents. The most common species are flycatchers.
Subspecies
Not recognized as a species by BirdLife International. Considered a subspecies of Malay Hawk-cuckoo (Hierococcyx fugax).
Considered by some authors to be a subspecies of Malay Hawk-cuckoo (Hierococcyx fugax).