Ducks and hens get pally!

I have let our 4 ducks in with the chickens (they seemed keen and I wanted to let them feed on the pond for a while)  I was amazed at how laid back both the ducks and chickens were about it - no hassle at all!  The main issue is that ducks seem to be able to eat at 90miles an hour and they are very greedy!  if i let them get on with it they would eat most of the food and the chickens would go hungry.  I solved the problem this time by scattering grain for the chickens while the ducks ate their vegetable and bran mash.  I still dont know which sex they all are but I am confident there is at least one spare male for christmas dinner (not looking forward to doing the deed though!!)