Okay, my two runners are almost 2 weeks old now - and I've been amazed at how much more quickly they grow than chicks! Last week, they both swam around just fine in the kitchen sink - this week, a bathtub was needed! Anyway, everything that I read addresses the fact that ducklings don't need to be brooded as long as chicks - but doesn't give any more detail than that. I keep lights on my chicks until 4 weeks (when feathered) during the summer. The ducklings have had the option of a light but have never used it (until yday, when one got chilled after swimming in the bathtub). When will they be old enough to go into a run (w/shelter)?