Praire dogs, (Mission, South Dakota)
Save your used cartridges, prairie dogs have enough trouble dodging .223 fire and don't need to be worrying about tripping over spent brass!
Please don't risk a prairie rattler bite just for a few cartridges hiding in the grass, let the brass catching system aviod ruining your whole day.
Statistics show in excess of 18 prairie dogs die each year after having choked to death on used brass, this suffering can and should be eliminated.
Always remember, the northwest is famous for its grasslands, not its brasslands!