grousewinged backswimmer

The grousewinged backswimmer is a type of insect belonging to the family Notonectidae. These insects are known for their unique ability to swim on their backs, using their long, oar-like legs for propulsion. They are found worldwide and are characterized by their boat-shaped backs and oval heads, typically measuring less than 15 mm in length. Backswimmers exhibit countershading, with a light-colored back that blends with the water's surface when viewed from below, and a darker underside that merges with the aquatic environment when seen from above. They prey on insects, small tadpoles, and fish, feeding on their body fluids. The grousewinged backswimmer, specifically N. undulata, is found in North America and can be observed swimming even under ice during winter.1