I usually mistake them for very young Hummingbirds, until I see them up close.
But Shorty - why would you want to hunt Carpenter Bees (or Borer Bees as we refer to them here)? For me they are a bit of a pain, leaving perfect half inch holes as they do but at least they are slow enough to wack'm with a Cedar shake and send them flyin', so to speak (lolol).......... Mikey.