Here is what I would do:
1-Build a slingshot contraption, a few pieces of wood and a giant rubber band.
2-Go down to your local bird store, pick up a few blue jays, maybe some red robbins and yellow canaries.
3-Place said birds in slingshot contraption and aim for the birds on your roof.
4-Give yourself 5000 points for each bird you get.
This is my favourite answer, even if it isn't very practical...
We have lots of robins in the garden but quite a bit of force is needed to get the required range so they invariably end up going squelch all over your hand, very messy!