"I've got big muscles."

These diving ducks were having a good time finding mussels at the bottom of the river and eating them with great vigor on the surface.  It's fun to watch them maneuver the clusters of shells and eventually get the meaty prize.  If I ever manage to make it to this spot on a sunny day... I hope to capture the dive.  Today didn't really allow a fast enough shutter speed for that kind of quick action.