December 2011 – vol. 104, issue 12, pp 743–746 The year 2011 has been a double-century year for the Eurasian Bittern Botaurus stel- laris (hereafter Bittern): not only did the number of booming males in England top 100 (Brit. Birds 104: 633), but it is exactly 100 years since the species was rediscovered breeding after a long absence from the country. ... This article is only available to registered users.To read more, please log in or purchase a subscription.