Comments: F. PEREGRINOIDES, a North African and Asiatic desert-adapted taxon, is considered a race of the cosmopolitan peregrine by some taxonomists. South American F. KREYENBORGI is a color morph of Peregrinus (AOU 1983, McNutt 1984). See Olsen et al. (1989) for a study of relationships within the genus FALCO based on electrophoretic patterns of feather proteins.
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