Weight Changes of Dunlins on the Dee Estuary in May

In an attempt to increase the number of breeding pairs of Long-eared Owls at Woodwalton Fen National Nature Reserve, wicker baskets of varying design were placed throughout the reserve. Between 1981 and 1996, owls used the baskets on 77 occasions. Of 71 nests followed from incubation, 59.2% hatched young and 50.7% fledged one or more chicks. In only two nests were the complete clutches hatched and fledged. Early nesters laid larger clutches and raised more broods than those nesting later in the season. It is suggested that the level of the water table and the management regime necessary for the restoration of open fen communities affect the number of breeding owls.