more fun to use LPG shove a wired up spark plug as deep down the burrow as you can reach, make a bunsen burner type gas mixer, say a piece of 1.5" alkathene pipe with a 1/2" gas hose from a 9Kg cylinder (don't bother with a regulator) down the middle, the gas jetting out the hose will pull air in and by the time it exits the end of the 1.5" pipe it's all mixed and explosive-ish. empty the cylinder into the burrow and go find a ditch to hide in. conect the spark plug to a battery and the gas will go boom not just killing any bunnies in the burrow that haven't been asaphixated, but collapsing the burrow
it's what the air force FAE bombs do