A few years ago when my father was still alive a young Robin appeared one day which seemed exceptionally tame, although he would not take food from our hands he would quite happily walk or fly up to either of us and take any food offered, in fact there was not just the one Robin, another around the same age and almost certainly from the same nest, used to inhabit the far end of the garden and he would take food from the hand, their territory seemed to extend to half the garden each.
The Robin the house end of the garden started coming in for food and would steal from our plates, one day he stood on the back of a chair and sung to us both after being well fed, whenever i was working on the border beds at the front of the house he would always be following me around, and would usually perch quite close to me and start singing, he would also frequently sit on my fathers knee as he relaxed in an armchair.
My father died one day and for months afterwards i never saw the Robin again, one day he did come back but by that time i had aquired my daughters dog which frightened him and that was the last time he came into the house, I did see him once more perched in a tree nearby, he called out to me and then flew off never to return.
I am sure there is more to some birds than we could ever imagine.
Just thought i would tell you that little story.
BK