PHDID YOU KNOW? 
Otters “hold hands” while sleeping, so they don’t float away from each other.
Sea otters spend most of their time in the water. They eat, sleep, hunt, mate and give birth in the water. To prevent themselves from floating away in the swirling sea while they sleep, sea otters often entangle themselves in forests of kelp or giant seaweed to provide anchorage.
This is also the reason why they hold hands. They do so in order to prevent themselves from drifting away from the group.
(s)torontopubliclibrary