River dolphins are a group of freshwater dolphins found in rivers and lakes, primarily in South America and Asia. They are known for their unique adaptations to living in murky waters, such as their long snouts and flexible bodies, which help them navigate and hunt for fish. The most well-known species include the Amazon river dolphin and the Ganges river dolphin. These dolphins are social animals, often found in small groups. They communicate using a variety of clicks and whistles, which help them locate each other and their prey. Unfortunately, river dolphins face threats from habitat loss, pollution, and fishing practices, leading to declining populations in many areas.