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) [XC265746]
by Peter Boesman from Gorod Ussuriysk, Primorskiy kray, Russian Federation (song, full song: part)
Rufous Hawk-Cuckoo (Hierococcyx hyperythrus) [XC528847]
by Wonseok Jang from Heiwa Koen, Aichi, 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).