Notonectidae, commonly known as backswimmers, are a family of aquatic insects found in freshwater habitats. They are characterized by their elongated bodies and unique swimming style, which involves moving upside down on the water's surface. Backswimmers have long, oar-like hind legs that help them propel through the water efficiently. These insects are predatory, feeding on other small aquatic organisms, including mosquito larvae and water beetles. Notonectidae are typically found in ponds, lakes, and slow-moving streams, where they play a role in the ecosystem by controlling pest populations and serving as food for larger animals, such as fish.