Whilst out portable in Devon last week I was "visited" by this very tame robin who came so close he ate an ant from my hand. I was able to take a really close-up picture from about 20cms away. In the USA the American robin is a totally different, and larger, thrush sized bird. In the UK it is not uncommon for robins to be so tame they will come very close to you when gardening and they can be trained to eat from your hand. There was a good book called "The Life of the Robin" by David Lack published by Fontana in their New Naturalist series. This is no longer in print.