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 an getting all the food.'
Arblaster hopes to bring the swans up to speed to restore the traditional arrangement. Link
(Image credit: ATEX)