Sea otters hold hands when they sleep so they don't drift apart, a behavior known as rafting.
Video Credit: Vancouver Aquarium
Full video on Youtube: https://www.youtube.com/watch?v=zHIIzcWqsP0&list=PLc4W06G5-v7BDRHoh7n3QkUKUDJmgMO0n
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@wonderofscience https://www.youtube.com/watch?v=4DPNtHsYqoY is an anime-style description of part of how otters' environment had shaped them.
