Are aquatic organisms transported by waterfowl?

[Al Agnew]

I always highly doubted that birds could transport stuff on their feet and have it live long enough to survive in the new waters.  Still do.  But there have also been studies showing that waterfowl can transport stuff in the feathers of their head, and since they spend a lot of time rooting around on the bottom with their bills, that makes more sense.  As for transporting in their digestive tract, apparently it's possible.