Glue some small paper cones to the ends of large sewing needles and you'll have a nice blowgun for mice, sparrows, and other hors d'oeuvres. <img src="/forums/images/graemlins/grin.gif" alt="" />
I sometimes carry an arrow shaft which doubles as an antenna mast (see Dryer Backpacker Yagi...make your own gear section), for that non-essential radio I carry. It doubles as a 'fire straw', tarp pole, blow gun, and hawaiian sling fish spear, with a broadhead screwed on the end.