This trap on Spurn Point is used by the British Trust of Ornithology to catch and ring birds for migration studies.
But a local sparrowhawk had better ideas for its use. I saw one rush in and as it did so all the birds scattered and got trapped by the wire. She then picked off a brambling and headed out again with her prize.
I felt sorry for the brambling, which had just made it across the North Sea. Bramblings are the Scandinavian equivalent of our chaffinch.