We had an interesting discovery last year with decoys. We hunt a mud slough in the backwaters of the Mississippi. Every year we get about 3 days where the widgeons are everywhere. IMO they are a very skiddish bird. You better take them on the first pass...if you don't, forget it. Well, the worst thing they do when they are circling is take mallards with them. I've seen this happen all the time. So a day after we saw all these widgeons, my buddy and I decide to change our spread. We put out a dozen drake widgeon decoys....we didn't see any widgeons, but every flock of mallard literally dove right in...seriously, I had never seen anything like this before. We limited out by 8 and stayed until 10 just to watch the mallards pitch in. Understand, there was a small flight on that day and these were new ducks, so we probably would have had a good day with mallard decoys as well...the next day we did the exact same thing.....only saw a dozen bunches of mallards, but they all gave us a serious look...we had good shooting, but they weren't finishing as well....you can bet we will be doing that again. By the way, on one those days when the widgeons were flying around, I went back out in the afternoon and had a good shoot. I swear those widgeons just fly all over the place in the morning (we are probably seeing the same birds over and over.....hunt em in the afternoon when they are tired!!! lol