The Bittern Botaurus stellaris currently numbers less than 50 pairs in Britain and is becoming scarcer (Day & Wilson 1978). It has long been known to be susceptible to severe winter weather (Riviere 1930), which may temporarily affect the population levels or even distribution in countries at the north of its range such as Sweden, Britain and the Netherlands (Cramp etal. 1977). Bitterns winter

...

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

Subscribe Now