have 3 1 week old call ducklings that have been hatched indoors artifically.....need some advice as to when they can be put outdoors. I have a secure pen and house but a tad worried it may be a bit cold for them yet. Should i wait a couple more weeks ? or are they hardy enough to go out now? I know that ducks live outside anyway but because they have been indoors until now i dont want them to become cold and ill. Thanks