Britannica Sources used in this answer

Which cuckoo subfamilies are restricted to the Old World?

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Cuculiform Body plans of representative Cuculiformes.

Within the order Cuculiformes, the family Cuculidae contains several subfamilies with distinct geographic distributions. The subfamilies that are restricted to the Old World are:

Cuculinae1
Centropodinae1
Couinae1

While the family Cuculidae as a whole is found in temperate and tropical regions worldwide, most of its subfamilies are limited to either the Old World or the New World, with the exception of the Phaenicophaeinae, which is found in the tropics of both hemispheres.1