From THIS IS SOMERSET:
Bishop’s Palace, Wells, has long been home to a pair of swans who stretch their necks to ring a bell by the gatehouse when they want to be fed. When one disappeared last year there was sadness throughout the city. But a new pair was brought in from Wales last week, and they have already learned to call for dinner.
Of course, if it was those brilliant Caledonian Crows, they would have reconfigured the bell into New Wells Extra-Large Collider (which finds the sub-Higgs-Boson . . . AND brings them food!)