[Alternative Title: What part of no don't you understand?]
Someone was asking for something other than just a small bird on perch image, hopefully this suffices.
Reason you don't see more, well it's not that easy to do: If you're framed up to get the chaffinch it's not easy to adjust in the couple of seconds available to reframe and get the complete action. Also DOF causes issues as there is much more that needs to be in focus to work and you'll be concentrating on the eye of the main bird. So a bit of luck is required and some good light!