This duck reminds me of he bath time rubber ducky with its cocked tail and relatively large head.
I think this bird was injured as it didn't climb of the mound and swim/fly away.
It is duck hunting season.
Ruddy Ducks lay big, white, pebbly-textured eggs—the largest of all duck eggs relative to body size. Energetically expensive to produce, the eggs hatch into well-developed ducklings that require only a short period of care.
source - https://www.allaboutbirds.org/guide/Ruddy_Duck/lifehistory