On 3rd February 1973 an adult male Peregrine Falco peregrinus was found dazed, with, little control of equilibrium, in upper Strathendrick, Stirlingshire. The bird ate little and died the next day. About 1st April 1973 an adult female Peregrine was found dead about 4 km from where the tiercel had been found. On analysis for organochlorine residues, both birds were found to be very heavil

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