Earth worms have on average five hearts and no lungs. They absorb oxygen through their skin.
The average ant has about 250,000 brain cells; a human has about 10 billion. It takes 40,000 ants to equal the brain of a human.
The bullet ant inflicts the most painful sting of all insects. One sting feels like being shot by a bullet.
Fire ants can build living floating rafts. When flooded, they grab onto each other using their jaws and sticky legs, forming a circular floating raft.