Experience elsewhere has shown that when species are reintroduced into locations from where they have been extirpated there is frequently opposition to that action. Such opposition usually relates to the introduction of so called "exotic" genes, that is, introduction of forms (subspecies) not originally native in that area. In the context of this paper we are referring to the introduction of Peregrine Falcons from other parts of Europe into Poland, recognizing that falcons from Poland may originally have had a distinct genetic makeup. We review the subspecies concept and the sources of variation found in Peregrine Falcons Falco peregrinus. The variation can be individual, local (deme variation), or geographical. Overlying morphological variation is a manifestation of genetic variation. All these natural variations argue against the notion that the same sort of falcon which existed earlier can be recreated. We conclude that as long as populations now allocated to the nominate subspecies Falco peregrinus peregrinus are reintroduced, then natural selection will reconstruct a population that is genetically fit to survive in that particular location. Further, normal, natural recoveries of depressed populations (without reintroductions) frequently result in a population that is genetically and /or morphologically different than the original population.
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