Post-mortems of Peregrines and Lanners with particular reference to organochlorine residues

1962, when the enquiry into the status of the Peregrine Fako peregrinus was completed (Ratcliffe 1963), there has been widespread concern about the decline of this species in Great Britain. Ratcliffe found strong circumstantial evidence that the persistent organochlorine insecticides were the cause, and the pattern of the decline showed a close correlation, both geographically and in time, with th...