Abstract

Abstract Different species of parasitic cuckoos deposit their eggs in nests of different host species, although a few incidental hosts are used in common by two or more species of cuckoo (e.g., Baker 1927, 1942; Kobayashi and lshizawa 1940; Friedmann 1964, 1967a; Kiyosu 1965; Jensen and Jensen 1969; Lack 1971; Gaston 1976; Payne 1977). Friedmann (1967b) proposed the term alloxenia to describe the situation in which related species of parasites tend to use different species of hosts. Host segregation probably evolved as a result of interspecific competition (Lack 1971; Wyllie 1981), but the process or mechanism of its evolution has not been proven.

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