What is a "water scorpion"?

A water scorpion is an aquatic insect that is well adapted to life in freshwater habitats. Despite its name, it is not a true scorpion but rather belongs to the family Nepidae. It has a long, slender body resembling that of a true scorpion, with an elongated abdomen that extends outwards, resembling a breathing tube. This tube, known as a siphon, allows the water scorpion to obtain oxygen from the air while submerged. It also uses its front legs to capture and immobilize small prey, such as small fish and insects. The water scorpion is an adept predator and relies on its camouflage and stealth to ambush its prey.