I have 15 ducklings (runners & welsh harlequins) and 2 geese (african & toulouse) that are 2.5 months old. They've been getting 6 cups of feed twice a day, but they haven't been cleaning everything up during their last 2 feedings. I have just started putting them out in a larger pasture during the day, so maybe they're full from foraging. However, they also didn't clean up their morning feeding, after they were locked up over night. Other than not eating all their feed, they're all acting pretty normal. Is this normal? Should I cut back what I'm offering, or could they be sick?