I have 6 ducks that are almost 11 weeks old (1 Pekin and 5 Caygua). I have had them since they were day old ducklings. I had them close to the house in their duck house with a plastic kiddie pool (they loved swimming in the kiddie pool). Last weekend I moved them and their house to the pond. They seem happy but WON'T SWIM or DRINK from the pond. Is this normal???? How do I get them to swim in the pond???