Allow yourself to anthropomorphize for a moment and check out this video of two otters "holding hands" while they nap
Now, for the real explanation, from a youtuber's comment:
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The reason they are doing this is because when they are in the wild, at sea, they wrap their bodies in floating seaweed so that they don't drift. These two are holding on to each other so they don't drift apart, it's an instinctual thing. Too bad the Vancouver Aquarium doesn't give them a realistic environment to live with (with some seaweed floating on the surface of the water).
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Before we start ragging on the Vancouver Aquarium, another youtuber points out:
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Tt would have to be plastic, I think. It's reeeeeeeeally difficult to care for a colony of seaweed unless you have a constant supply of fresh seawater afaik. OTOH Monterey aquarium has fresh seawater and a seaweed exhibit but no seaweed in the sea otter exhibit so maybe there are other factors involved.
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