By accident we rescued a Black East Indies duckling (the by product of a couple getting a divorce), we think is about 3 mo old. Evidently the only other hatchling died shortly after hatching. So, is their a way to tell the sex at this age? It has one small white spot on it's chest. We have chickens but we are keeping it in a separate run and house for now. I know it needs a buddy, but this whole thing was unplanned so we are trying to do our best to keep it happy for now. Also, we are feeding it chicken grower feed (unmedicated), but it doesn't seem to crazy about it. It seems to like worms and fresh corn, but I want those to be snacks - not the main food. Someone told me to add brewers yeast to the feed for extra niacin? It seems to enjoy eating food it it's thrown in water? As I said, we have been raising a small flock of chickens so this little guy/gal is definitely different.