Mallard Sinikael-part Anas platyrhynchos
The video documentation from last night shows the targetted and “trained” activities for getting hold of the trout roe from the bottom of the stream. We have not had cause to link the presence of mallards at trout spawning grounds with looting. But it seems unlikely that the birds yesterday, seen acting so purposefully, would be the only ones to behave like this
Images arranged for comparison by Hagnat, LK forum