When I went outside to get a picture of them they waddled all the way to my back door - I wouldn't have been surprised if they had let me pat them! (Didn't try though, because then my son would have tried and probably poked their eye out!).
They are obviously looking for food, but I didn't give them any because I remember being told that bread is actually bad for them - besides, as much as they are a lovely surprise - I don't think it would be healthy for them to set up house here when we don't have a pool!