Abstract
1. Researchers have ascribed the decline observed in Gyps coprotheres populations during the past years to various factors. 2. The possibility of organochlorine insecticide contamination was considered by analysing the blood of 42 Cape griffon vultures in order to detect the presence of DDT and metabolites thereof. 3. DDE residues were measured in 42 individuals of which 11 samples contained concentrations greater than levels causal to eggshell thinning in some raptor species. 4. Results obtained in this study indicate that attention should definitely be given to the possibility of organochlorine pesticide contamination.
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