I have a big black cat who I quite often find snoozing on the bails of hay in the duck pen with the ducks sleeping around him. Sometimes he's dash in the house with wet clumps of fur where the ducks have beaned him, but for the most part they are very amicable.
But my other cat is a brawler with neighborhood dogs and our own Pit Bull (small horse) that he grew up with. He might consider the idea, since he thinks he's a dog, but some flapping wings and loud quacks would send him scurrying to hide behind Dad. 
