Though this video is cute it's far from unique. This is typical otter behaviour in the wild so totally natural that aquarium otters would do this. One or more otters with grab a piece of kelp and wrap it around themselves to anchor themselves in place since the kelp attaches to rocks on the bottom of the ocean. The others will link arms and make what they call a "raft" of sea otters. I learned this from staff at the Seattle Aquarium where we have several sea otters and the most successful captive breeding program in the world. This Spring I want to head to the coast of Washington to Destruction Island where the highest concentration of sea otters call home. Laura [Posted in FML 5784]