The Family Lipotidae consists of the baiji or Yangtze River dolphin (Lipotes vexillifer), a freshwater cetacean that was native to the Yangtze River in China. Baiji were adapted to riverine life, with a long, narrow snout for catching fish and small, paddle-like flippers for maneuvering in shallow waters. They relied heavily on echolocation for navigation in murky waters. Once considered a symbol of the Yangtze River’s biodiversity, the baiji faced severe threats from habitat destruction, pollution, and fishing practices, leading to their likely extinction in the early 21st century. Lipotidae is notable as a family because it represents the only known river dolphin species in China and highlights the vulnerability of freshwater cetaceans to human activity.