So, last night, bombing down the lake, I noticed these "blotches" in the snow. This morning I checked them out. They appear to have been made by large birds. My first thought was that an owl or eagle was after prey. I did not find any tracks of rabbits or other animals at all. I did notice that there were pieces of moss, small branches and pine needles. So now I'm thinking that maybe it was some kind of raven/eagle breeding dance??? The pictures are not great. poor contrast of white on white.