Rita,
We had the same thing here during a snow storm in March. They came in flocks and ran some other birds off the feeders. I got a couple of pictures out of a back window, but they were grainy because of the snow and wind. They seemed aggressive and hungry. We had a lot of snow in the ground at that time. I haven't seen any this fall and winter. Here's the best shot I could get. I saw Ann's thumb down, and I tend to agree, but as you said they have done no harm. They are usually ground feeders when the snow is gone.
