Haha, I know, but don't all ducks? It helps when they free range your yard. They don't eat as much when they have 24/7 access to grass.
Pekins eat the most. Its a fact that ducks can eat as much as they want and never be full. But Pekins will eat more faster then others, thats why my pekins are the fatest, my dad always mistakes them for my goose. XD