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The evidence advanced to link the decline of the Peregrine Falcon to the use of certain persistent organochlorines is reviewed. Pesticides are considered to have been a major factor in the decline of the peregrine, and the level of DDE in the egg at which hatching failure occurs is 15-20 ppm. Levels of DDE and PCB in typical prey species in North America are reviewed and it is recommended that this factor be carefully considered before reintroduction attempts are undertaken. High buildings in big cities appear to be good sites for reintroduction.
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David B. Peakall (1976) studied this question.
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