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 Isle, Shetland, while Overskaug & Kristiensen (1994) found a ratio of 13F : 23M among winter accident victims in Norway. These findings sugge

...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now