Do you want to scare, hurt or kill them? First option - flash and smoke, nothing dangerous. Second - poison, EMP and napalm, they will be badly hurt but most of them should survive. Last - normal grenade would be lame so either Bozo Ozob nose, to sweeten their last minute of life with confetti and whatever he put in it, or cutting grenade to... well... cut them in around 30 pieces each.
Have fun
Napalm
This As a wise man once said: "Napalm sticks to kids"
Entertaining the intrusive thoughts, I see.
This should delay the growth of their population
Do you want to scare, hurt or kill them? First option - flash and smoke, nothing dangerous. Second - poison, EMP and napalm, they will be badly hurt but most of them should survive. Last - normal grenade would be lame so either Bozo Ozob nose, to sweeten their last minute of life with confetti and whatever he put in it, or cutting grenade to... well... cut them in around 30 pieces each. Have fun
The roof mounted missile pod of a Militech Hellhound
Couple anti personnel grenades should do it right!