Abstract
Peregrine Falcon (Falco peregrinus) diets vary widely. On the Pacific Coast of North America, they feed on petrels and alcids (Oceanodroma, Synthliboramphus, Ptychoramphus) (Green 1916, Brooks 1926, Bent 1938, Beebe 1960), while in the Gulf of California they take Eared Grebe (Podiceps nigricollis), Black Storm-Petrel (Oceanodroma melania), Least Storm-Petrel (O. microsoma), Red-necked Phalarope (Phalaropus lobatus), Bonaparte's Gull (Larus philadelphia), Heermann's Gull (L. heermanni) and Craveri's Murrelet (Synthliboramphus craveri) (Porter and Jenkins 1988). Due to seabird coloniality, close to exclusive dependence of individual Peregrine Falcons on particular prey species may put their survival in an inverse relation to the degree of pollution of marine areas where their prey feed. In the case of Rasa Island, 95% of the population of the two main prey species nest synchronously, providing close to 300,000 prey available for three months.
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