[Listed from small to excruciating pain levels]: Porcupine -- Scorpion -- Harvester Ants -- Fire Ants -- European Paper Wasp -- Velvet Ant -- Tarantula Hawk -- Honey Bee -- Bullet Ant -- Warrior Wasp -- Executioner Wasp.
Summary
The author tracks down stinging animals and chronicles getting stung by each of them, including a scorpion, fire ants, and executioner wasps.