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Notonecta glauca, the common backswimmer, any of a group of insects (order Heteroptera) that occur worldwide and are named for their ability to swim on their backs, which are shaped like the keel and sides of a boat. The backswimmer uses its long oarlike legs for propulsion and has an oval-shaped head and an elongated body, generally less than 15 mm (0.6 inch) in length. It is a good example of countershading, as its light-coloured back, seen from below, blends into the water surface and sky. The rest of the body is darker and, when seen from above, blends with the bottom of the body of water in which it lives.

Because the backswimmer is lighter than water, it rises to the surface after releasing its hold on the bottom vegetation. Once at the surface, it may either leap out of the water and fly or get a fresh supply of air, which is stored in a bubble under its wings and around its body, and dive again. The backswimmer is often seen floating on the water surface with its legs extended, ready to dart away if disturbed. It preys on insects, small tadpoles, and fishes, sucking their body fluids through its strong beak.

When the backswimmer pierces his prey he emits a toxic saliva that subdues the prey, enabling him to suck out the prey's bodily fluids. When he attacks a human, or a dog, there is a painful reaction combined with a burning sensation, comparable to that of a bee sting.