Sea otters hold hands while sleeping.

This cute animal is found in the northen pacific ocean. They are the biggest animals in the weasel family. These animals have a lot of interesting things. For instance, they wrap themselves up whith plants from the ocean floor to cover their body. In addition, they are different from otthers mammals. They do not use thick layers of fat to keep them warm. They use their hair to keep them warm. They have a dense fur, almost a million hairs per square inch. In contrast, humans have 100.000 hairs in their wole head.

The most interesting thing about this annimals is their sleeping habits. They hold each others hands while they sleep so they do not separate each other from the group while they are sleeping. They do several things together. For instance, they eat in groups while they eat and rest. They use plant over their body while they sleep, as well.

Source: https://en.wikipedia.org/wiki/Otter