I have 4 adult females for our Drake and I think that is bare minimum
Leah Sattler wrote:in my experience ducks make a huge mess within hours if provided a water source.
I rescued both Musckies and some Mallard-based ducks (runners and Campbells, not Pekins) and the Musckies make far less mess in their water bucket than the other do. I'll swear the Mallard-based ducks can total a bucket of water in 27 seconds, the Muskies bucket is usually OK for 2 days. If running the different groups together I'd get one of the small cup or nipple water systems so that you'd be sure there was always some "clean" water available. Ducks need deep water (whole head in) but chickens don't.