The South American lungfish is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay, and lower Parana River basins in South America. Notable as an obligate air-breather, it is the sole member of its family Lepidosirenidae. South American Lungfish is a solitary species. They live by themselves in burrows that they construct in swamps or lakes. They are mostly inactive, laying in the muddy or shallow water close to the surface in order to breathe. Other behaviors, such as social structures and interaction with other species are largely unknown.