Young squirrels scrounging for seeds

At one point there were at least 6 little squirrels out there. They put their tails on their backs to keep warm. I think they are only like a year old, because there are other squirrels that are larger that are downright fat. The place is still covered in a sheet of sleet so I haven't been able to refill my birdfeeder in the back of the house. The squirrels weren't interested in the old tortilla we threw out there.