Brood Parasitism by the Pied Crested Cuckoo Clamator jacobinus

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Abstract
In the course of a study on the ecology and behavior of babblers (Turdoides spp.) near Delhi, N India, a number of observations on parasitism by the pied crested cuckoo (C. jacobinus) were made. The behavior of the cuckoo, the timing of its breeding in relation to that of its host species, the relative densities of parasite and hosts, the intensity of parasitism and its effects on the breeding success of the host species are described. Measurements of the growth rates of cuckoo and host nestlings are compared. The adaptations of the genus Clamator to brood parasitism are compared with those of the genus Cuculus and the differences related to the type of hosts selected. General strategies for brood parasitism are discussed. Turdoides is particularly suited to exploitation by brood parasites in India.

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