So I know the simple answer to that is.... "Why not?" I have a temporary 'foster' duck that is living outside, and my pride and joy indoor duck, Q. The two have never met, and poor Q has been sequestered to the house only since the foster duck had mites somethin' terrible, and I didn't want him to share his little carry-ons with Q. Well the mites are cleared up. He has been here 3 weeks. Now Q would like to go outside and play in her duckpond (baby pool) again. I'm wondering if I can allow them to swim together? Q is a non-aggressive muscovy girl, and the foster is a big pillow of a pekin male. He is twice her size, but he is also blind and gimpy, so I don't see him being successfully aggressive with her. I'm more concerned about 'outdoor duck cooties' like internal parasites or what have you. Is there any reason I should now allow them to intermingle (supervised of course) or swim together while I'm out doing yard work? Thanks.