Do River Otters live in group?

River otters are known for their social behavior and living in groups called "romps" or "rafts". The size of the romp can vary depending on the species and environmental conditions, but they typically range from two to twelve individuals. Within the romp, there is usually a dominant breeding pair and their offspring. River otters establish territories and defend them against other romps. They communicate through vocalizations, scent marking, and physical interactions to maintain social cohesion. However, some river otters may also live solitary lives, especially in areas with limited resources.