The other nifty inventions in that picture are the things in the back that look like small mortar batteries -- in a way they are. They're called "Bumper Boys", and they fire bumpers by remote control. You have to acclimate your dogs to them though because they smell like gunpowder . . . . they're fired off with .22 cal primers.
I wondered what those were! They really do look like a mini version of the vehicle-mounted Multi-Rocket Launch Systems that the military uses. Pretty cool! It’s nice to know they just use them for bumbers though. I can see that being pretty rough on a quail or chuckar! You’d wind up with pâté. ;o)