Sea otters hold hands while they sleep so they don't drift away from each other.

Sea otters live in the chilly waters of the North Pacific Ocean. Because they spend so much energy swimming, they have to eat about 25% of their body weight every single day just to stay warm. When it is time to rest, they gather in groups called rafts that can have anywhere from 10 to 100 otters floating together.In 2007, a famous video from the Vancouver Aquarium showed two otters holding hands, which made people all over the world fall in love with them. This isn't just cute behavior. It is a survival trick that keeps families together in the moving water.If there aren't any friends nearby to hold onto, otters use giant kelp as an anchor. They wrap the long, leafy seaweed around their bodies like a seatbelt to stay tied to the ocean floor. This keeps them from floating out into the deep, dangerous open ocean.Staying in shallow water helps them hide from predators like Great White Sharks and Orcas. To stay afloat, they rely on their amazing fur. They have the thickest fur of any animal on Earth, with up to 1 million hairs per square inch. This fur traps air bubbles, acting like a built-in life jacket that keeps them bobbing on the surface.