Whoopers in the dark

Druridge pools blog commented on Whooper Swans heading back North at the weekend. On returning home from work at 2050 this evening the call of Whooper Swans could be heard flying over the garden. Listening to the calls the birds were flying in a North East direction possibly following the course of the river. Will they drop down onto Bothal pond or the open water at Woodhorn for the night or will they carry on with their migration regardless of the time of day or the inclement weather?