Dale, L / October 1996 – vol. 89, issue 10, pp 429–436 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... This article is only available to registered users.To read more, please log in or purchase a subscription.