BBC - Earth - the World’s Most Painful Insect Sting
The bullet ant (Paraponera clavata) gets its name from the shot of intense pain it delivers with its venom-filled sting. The recipient experiences its agonising effects for the next 12 - 24 hours.
Living in the South American rainforest and growing to around an inch (2.54cm) long, most of us are capable of keeping out of its way.
Level four you don’t want to know
However entomologist Dr Justin Schmidt has got close enough to this vicious ant in attack mode to rate its sting as the most painful in the world.
He describes the experience as: “Pure, intense, brilliant pain. Like walking over flaming charcoal with a three inch nail embedded in your heel.”