Bombardier beetle

Bombardier beetles are ground-dwelling beetles of the genus Brachinini, Paussini, Ozaenini, or Metriini - more than 500 species altogether. They are most notable for the defense mechanism that gives them their name: They can fire a mixture of chemicals from special glands in their posterior.

Bombardier beetles have come to public attention in recent years largely because of arguments put foward by opponents of biological evolution, particularly in the children's book Bomby the Bombardier Beetle. The book argues that the beetles' internal design, in which certain chemicals must be mixed in certain ways at certain times to produce tiny explosions, is so complex and fraught with peril that it could not have come about through random mutations, but must be the product of intelligent design, a modern euphamism for God.