Freshwater dolphins are unique species that inhabit rivers and lakes, primarily found in regions like the Amazon River and the Yangtze River. Unlike their oceanic relatives, these dolphins have adapted to live in freshwater environments, developing features such as a more rounded body and a flexible neck. The most well-known species include the Amazon River dolphin and the critically endangered Yangtze River dolphin. These dolphins play a crucial role in their ecosystems, helping to maintain the balance of aquatic life. They primarily feed on fish and other small aquatic animals, using echolocation to navigate and hunt in murky waters. Conservation efforts are essential to protect these species from threats like habitat loss and pollution.