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<==o Cuculina
|-- Surniculus lugubris (drongokäki)
`--+-- Penthoceryx sonneratii (Kirjokäki)
`--+--o Cacomantis (Pensaskäet)
| |-- C. sonneratii (kirjokäki)
| |-- C. passerinus (Grey-bellied Cuckoo)
| |-- C. merulinus (Valittajakäki)
| |-- C. variolosus (pensaskäki)
| |-- C. sepulcralis (indonesianpensaskäki)
| |-- C. castaneiventris (papuankäki)
| |-- C. heinrichi (molukkienkäki)
| |-- C. flabelliformis (viuhkakäki)
| `-- C. pyrrhophanus (viuhkakäki)
`--o Cuculus (haukkakäet)
|-- C. crassirostris (Celebesinhaukkakäki)
|-- C. sparverioides (Isohaukkakäki)
|-- C. varius (Haukkakäki)
|-- C. vagans (Viiksikäki)
|--o C. fugax (Kiljukäki)
| |-- C. f. hyperythrus (Northern Hawk Cuckoo)
| |-- C. f. fugax (Hodgson's Hawk Cuckoo)
| `-- C. f. pectoralis (Philippine Hawk Cuckoo)
|-- C. solitarius (Punarintakäki)
|-- C. clamosus (mustakäki)
|-- C. cafer (Mustakäki)
|-- C. micropterus (Intiankäki)
|-- C. canorus (käki)
|-- C. gularis (Afrikankäki)
|--o C. saturatus (Idänkäki)
| |-- C. s. saturatus (Oriental Cuckoo)
| `-- C. s. lepidus (Sunda Cuckoo)
|-- C. poliocephalus (Pikkuhaukkakäki)
|-- C. rochii (Madagaskarinkäki)
`-- C. pallidus (Valkoniskakäki)
Feduccia, A., 1980: The Age of Birds.
–Harvard University Press, Cambridge, Massachusetts & London, England, 1980, IX-196
Feduccia, A., 1996: The Origin and Evolution of Birds.
–Yale University Press, New Haven, 1996, x-420
Hughes, J. M. 2000: Monophyly and phylogeny of cockoos (Aves, Cuculidae) inferred from the osteological characters.
–Zoological Journal of the Linnean Society: vol. 130, #2?, pp. 263-307.
Olson, S. L., 1975: Paleornithology of St. Helena Island, South Atlantic Ocean.
–Smithsonian Contributions to Baleobiology: Vol. 23, pp. iv-49
Olson, S. L., 1985: The fossil record of birds. 79-239.
in Farner, D., King, J. & Parkes, K. (eds.), 1985: Avian Biology. vol VIII.
–Academic Press, New York. 1985.
Sibley, C. G. & Monroe, B, L., 1990: Distribution and taxonomy of birds of the world.
–Yale University Press, New Haven & London, 1990. xxiv-1111.
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