Bombardier Beetle when threatened, sprays the attacker with a boiling hot mixture of caustic chemicals reaching 212° F (100° C). Even more impressive, the bombardier beetle can aim the poisonous eruption in the direction of the harasser.
The beetle itself is not harmed by the fiery chemical reaction. Using two special chambers inside the abdomen, the bombardier beetle mixes potent chemicals and uses an enzymatic trigger to heat and release them.
The foul concoction does burn and stain the skin. This defence proves effective against everything from hungry spiders to curious humans. Via When the bombardier beetle attacks it really bombs its enemies.