Where did all the ducks go?

There is a quarter-mile stretch of the Parkway that has a good view of the Jordan River. In the past when I've run that stretch after sundown, I would see hundreds of ducks in the river settling down for the night. Tonight, though, as I ran that stretch on my way back, I only saw a few ducks, perhaps 15-20 ducks. Also, I didn't see any ducks near the Parkway path foraging for food. I guess that with the advent of warm, spring-like temperatures, the ducks have gone to other parts of the valley. If we have a cold snap come in, it will be interesting to see if the ducks return.