This was the highlight of my day. I ate lunch in the garden at Mass General and this little bird was my companion. He didn't eat much nor was he the greatest conversationalist, but we got along just fine.
What animal (or type of animals) could you watch for hours? Birds. For sure. I love watching them fly and flit and jump about. I find them fascinating. As a kid my mom would take us 'bird-watching' and it is one of my fondest memories of childhood.