
However the pair of ducks are more than happy to help out and grab some food for themselves. Caretaker Paul Arblaster said: 'The new pair of swans are a rehabilitated pair that were given to us to rehome. We've tried to train them to ring the bell as usual but they seem very shy.
'Instead there is a pair of Muscovy ducks which are ringing the bell all the time and getting all the food.' He added: 'The swans seem shy - they hang back and let the Muscovy ducks do the ringing. I think some of the tourists expect the swans to ring the bell but the ducks have learned to do it.
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'I think the original idea was to feed them to stop them flying away. But the swans are slowly improving - hopefully they'll get there in the end.' The centuries-old custom is believed to have been started by the daughter of a palace caretaker and has continued uninterrupted since.