Children (11 direct children, 13 direct and indirect children):
Common hawk cuckoo
(tree size 2)
Hierococcyx varius
Large hawk cuckoo
Hierococcyx sparverioides
Malaysian hawk-cuckoo
Malay hawk-cuckoo
Moustached hawk-cuckoo
Hierococcyx vagans
Philippine hawk-cuckoo
Hierococcyx pectoralis
Whistling hawk cuckoo
Hierococcyx nisicolor
Hierococcyx bocki
Dark hawk-cuckoo
Northern hawk cuckoo
Rufous hawk-cuckoo
Hierococcyx crassirostris
Hierococcyx nanus
Hierococcyx nisoides