Unequal sex-ratio, mortality causes and pollutant residues in Long-eared Owls in Britain
01 October 1996
Main paper
Recent reports have indicated an uneven sex-ratio among wintering Long-eared Owls Asio otus, in favour of males in Norway and females in Britain. Harvey & Riddiford (1990) found a ratio of 28F : 8M among trapped autumn migrants on Fair Is...
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