THANKS for the solid advice so far.
It's really my option of what yardage I take these things out at. But the further away they are when they drop, the less it points the finger at me if someone see's the thing go down. Some of the grey haired female folk in the area have started feeding these da#$ things. If one of these well meaning
idiots pieced together what happened to their cute little flea spreading hobo friends... It would be
BAD! 
Since these things showed up my dog and my neighbors dogs have been getting eaten alive with fleas everytime they go outside. On top this there's a chance our dogs could be woopin on one of them and contract rabbies or something.
NOT COOL!It looks like the "Bone Collector", and "Whisper" are mechanically the same. The stock on the "Bone Collector" is a little nicer IMO.
Does anybody know if the power this type of rifle fires at is adjustable at all? I know paint ball guns offer this. It'd be nice if I could "tune it down" a bit for a warning shot if needed.