Don’t mess
with those bombardier beetles
gathered in groups
in a world of woods.
This warning’s for ants,
frogs and people:
THEY’RE HIDING A CANNON
INSIDE THEIR CABOOSE!

This chamber of secrets?
A chemistry lab,
cooking up bombs
in their abdomen.
Steaming-hot acid,
fired out in zaps.
Toxic and boiling,
again and again.

They’ll twist round their torsos
well enough
to aim at whatever
caused them to huff.
But their tail-end skin
must be really tough …
or their rears would be hurting
when squirting that stuff!
Bombadier Beetle

https://www.wired.com/2014/05/absurd-creature-of-the-week-bombardier-beetle/