I had an interesting experience the other day. I was hunting some ice with a small opening and there were no shortage of ducks. I was sitting right in the water on the edge of the ice with complete white camo, even my face. The day was partly cloudy. I noticed when I was in full sunshine all species of ducks were coming right into the dekes. When the clouds covered up the sun, most of the ducks came in as usual except the mallards. They would almost always flair at 100 to 60 yards when the sun was covered up. I know this is just one observation on one day. But I definitely preferred it when the sun was out.