'Fat' robin....

While I was at Marsworth reservoir this morning I had a strange feeling I was being watched. Turning around, this individual was sitting expectantly on a post just a few feet from me. As I had nothing to offer, I apologised. The temperature at the time was -10 and you can see this individual is really puffed up and keeps lifting one leg under its feathers. It is not 'fat' as many people presume and a long, frozen night could be fatal if it can't find enough food.