Hierococcyx

Hierococcyx
Philippine hawk-cuckoo (Hierococcyx pectoralis)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Cuculiformes
Family:	Cuculidae
Genus:	Hierococcyx Müller, 1845
Type species
Cuculus fugax Horsfield, 1821
Species
8, see text

Hierococcyx or hawk-cuckoos is a genus of birds in the cuckoo family Cuculidae. They are distributed in South, Southeast, and East Asia. The resemblance to hawks gives this group the generic name of hawk-cuckoos.

They are known to vocalize at their breeding grounds, making identification based on calls easy.^[1]

Taxonomy

The genus Hierococcyx was introduced in 1845 by the German naturalists Salomon Müller to accommodate a single species, Cuculus fugax Horsfield, 1821, the Malaysian hawk-cuckoo.^[2] This species is the type by monotypy.^[3] The genus name combines the Ancient Greek ἱεραξ/hierax, ἱερακος/hierakos meaning "hawk" with κοκκυξ/kokkux, κοκκυγος/kokkugos meaning "cuckoo".^[4]

In the past the genus was sometimes included in the genus Cuculus.^[5]

Mimicry

Hawk-cuckoos closely resemble accipiters in terms of appearance, an elongated body with long wings and tail, greyish or brownish upperparts with paler barred upperparts, as well as their swift direct flight.^[6]

Underpart barring, a form of Batesian mimicry, tends to alarm small birds targeted by hawk-cuckoos for brood parasitism beyond only shape and colour. The seemingly dangerous appearance of the cuckoo reduces host aggression or mobbing, resulting in more opportunities for the cuckoo to parasitise the host.^[7]

Species

The genus contains eight species:^[8]

Image	Common name	Scientific name	Distribution
	Moustached hawk-cuckoo	Hierococcyx vagans	southern Myanmar including Mergui Archipelago, Malay Peninsula, Sumatra, and Borneo
	Large hawk-cuckoo	Hierococcyx sparverioides	breeds from Himalayas of northeastern Pakistan eastward to southern China, and southwards to hills south of the Brahmaputra River to Taiwan; winters from southern India (Eastern and Western Ghats) eastwards to lowlands of the Malay Peninsula
	Dark hawk-cuckoo	Hierococcyx bocki	mountains of Malay Peninsula, Sumatra, and Borneo
	Common hawk-cuckoo	Hierococcyx varius	India to Nepal, Bangladesh, and Myanmar; Sri Lanka
	Northern hawk-cuckoo	Hierococcyx hyperythrus	breeds southeastern Siberia, northeastern China, Korea Peninsula, and Japan; winters to southeastern Asia, northern Borneo, and northern Sulawesi
	Philippine hawk-cuckoo	Hierococcyx pectoralis	Philippines
	Hodgson's hawk-cuckoo	Hierococcyx nisicolor	breeds Himalayas from eastern Nepal and hills south of the Brahmaputra River eastwards to eastern China, from southern Sichuan northeast to Jiangsu and southeast to Hainan, and northern southeastern Asia; winters to Greater Sundas
	Malaysian hawk-cuckoo	Hierococcyx fugax	southern Thailand, Malay Peninsula, and Greater Sundas

References

1. Eaton, J. (2018). "Identification of Hierococcyx hawk cuckoos, and the first record of Northern Hawk Cuckoo Hierococcyx hyperythrus for continental South-East Asia". BirdingASIA. 30: 68–73.
2. Müller, Salomon; Schlegel, Hermann (1845). Verhandelingen over de natuurlijke geschiedenis (in Dutch). Vol. 1: Land- en Volkenkunde (Section 8). Leiden: In commissie bij. S. en J. Luchtmans en C.C. van der Hoek. p. 233, note. For the publication date see: Husson, A.M.; Holthuis, L.B. (1955). "The dates of publication of "Verhandelingen over de natuurlijke Geschiedenis der Nederlandsche overzeesche Bezittingen" edited by C. J. Temminck". Zoologische Mededelingen. 34 (2): 17–24.
3. Dickinson, E.C.; Remsen, J.V. Jr., eds. (2013). The Howard & Moore Complete Checklist of the Birds of the World. Vol. 1: Non-passerines (4th ed.). Eastbourne, UK: Aves Press. p. 148. ISBN 978-0-9568611-0-8.
4. Jobling, James A. "Hierococcyx". The Key to Scientific Names. Cornell Lab of Ornithology. Retrieved 26 March 2026.
5. Peters, James Lee, ed. (1940). Check-List of Birds of the World. Vol. 4. Cambridge, Massachusetts: Harvard University Press. p. 14.
6. Davies, N.B.; Welbergen, J.A. (2008). "Cuckoo–hawk mimicry? An experimental test". Proceedings of the Royal Society B: Biological Sciences. 275 (1644): 1817–1822. doi:10.1098/rspb.2008.0331. PMC 2587796.
7. Welbergen, J.A.; Davies, N.B. (2011). "A parasite in wolf's clothing: hawk mimicry reduces mobbing of cuckoos by hosts". Behavioral Ecology. 22 (3): 574–579. doi:10.1093/beheco/arr008.
8. AviList Core Team (2025). "AviList: The Global Avian Checklist, v2025". doi:10.2173/avilist.v2025. Retrieved 26 March 2026.