How deep or shallow is ‘ridiculously shallow’? I don’t think we know the depth of the lake, do we? At 200m from the shore, that could be quite deep. Certainly enough for a swimming mammal. A moose height to shoulder level can be between 1.7 and 2.1m. For example one of the smallest lakes in the Lake District, UK, Coniston Water has maximum depth of 56m.
from Wikipedia for the European Elk:
Finland,
Sweden,
Norway,
Latvia,
Estonia and
Russia. No longer present in central and western Europe except for
Poland,
Lithuania and
Belarus, with a certain population in the
Czech Republic,
Slovakia and northern
Ukraine, including
Bohemia since the 1970s; recently sighted in eastern
Germany (the range formerly included
France,
Switzerland and the Benelux nations). Population increasing and regaining territory. Males weigh about 320 to 475 kg (705 to 1,047 lb) and females weigh 275 to 375 kg (606 to 827 lb) in this mid-sized subspecies. Shoulder height ranges from 1.7 to 2.1 m (5 ft 7 in to 6 ft 11 in)
Agreed though it’s unlikely Elk.
I think
@deirdre may have nailed it. It could be floating ice, out of focus and with poor resolution, with the sun enhancing the bobbing movement. We can see from the OP video, there is plenty of floating ice around and the commentator already mentioned something seen sub-surface, so that fits submerged ice occasionally topping. When it disappears and re-emerges, that could be different sections of ice. The information we don’t have is wind direction and strength of wind to create surface movement. We also do not know if there are any natural currents from the various sources around the lake. It looks almost still or dead calm on the surface, but with a resolution as poor as that, it would struggle to pick up a tsunami!.......
it should be easy as the location and options are really limited, but the quality of the video has us all guessing.