The otter is well known for its playful nature, and the little guys in this video can vouch for that. When they are happy, they can engage in a slew of behaviors, such as making water slides and sliding into lakes. They also find throwing and playing with stones enjoyable. As for how they behave in packs, the fun is only increased and so is the noise. Otters are rarely on their own and thrive better in small groups. An average otter social group consists of an adult pair, one or more young adults, and a baby or two. Groups have also been reported to reach a surprising 20 otters. The only otters who are typically solitary are sea otters, but even they like to have fun with their friends.