I brought home 4 more ducks from my work just to take care of them for the weekend since they go thro water soo quick..anyhow.. 2 of the ducklings cant swim.. well they can but r constantly going under water and only there head sticks out of the water barely...what do i do? should i just buy them and get some helium so i can fill up ballons and tie around there waist so they dont sink? i have never seen this b4 ..i thought all ducks and geese could swim but these 2 little ducks are more rock then air.. what do i do?