Ducks should be given oats or lettuce but not bread
6 April 2015 Last updated at 07:10 BST
Spring is here so the time is right to head down to your local park and feed the local ducks.
But the people who look after lots of rivers in England and Wales want us to stop giving them their traditional snack.
So what should we feed the ducks instead?
Ayshah's got more details.