I hate to bring this thread back from the dead but I felt I should let you guys know what happened (lost my laptop for a while ;-; ). OK! I left them in that night together and what do you know they both worked together! The cascade adopted all of the babies while the Khaki tried to pick on hers but after a month she adopted them too. It was pretty funny to watch, the babies walked in the middle while they walked on each side. The babies seemed to favor the cascade which was kinda unfortunate since she was a great protector but not a good teacher, the ones that followed the khaki more are the best gardener helpers. Anyhoo I was shocked how well the got on, they even became best friends, if one was in trouble the other ran to help (by in trouble I mean being harassed by a drake), at one point though after the babies got their first real feathers the Khaki seemed bored with the whole thing and sort of let the cascade do it alone. But she didn't want to and would follow the Khaki, it seems like the babies really benefited from having them both and only 1 baby out of the 20 was lost but I think it was just really weak. I don't think this would have worked if it was the other way around with the khaki or another flighty breed but the larger broodier ducks seem more willing to share. If someone else was to try it I would recommend putting the babies all in a crate during the night that they can't get out of while the mother ducks sort it out and then let them all out together in the morning. Its really cute seeing them waddle around together and tell the other ducks to back off when they come by. I'll try and post a picture tomorrow.