I've got four 6-week-old ducks: two pekins and two rouens. I've also got a 5-acre pond. They aren't that interested in swimming. Are they just too young? The two times they've been in we've basically had to push them in the water a couple of times until they stop and get the idea that it's wet and they can blow bubbles in it. Then they swim around, no more than 4 feet from the shore and come out the moment we walk away. Will they get the idea eventually?