Duck divers: hooded mergansers in Como Lake

Stunning wildlife videos just fall into my lap these days, and it's mid-winter! I've only ever seen these hooded mergansers as white blobs in the distance, too far away to film. Now for some reason they are swimming much closer to shore. We also see cormorants, sea birds which you almost never see in freshwater lakes, though the fact this lake is stocked with fish might have something to do with it.