Mortality of Sparrowhawks and Kestrels

The findings of Newton et al. (Brit. Birds 75: 195-204) are similar in most respects to ours (Keymer et al. 1981). We wish to comment, however, on some important differences, especially regarding organochlorine poisoning. The authors stated that each bird was 'deep frozen until it could be examined'. Deep-frozen carcases are unsatisfactory bec

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