Sea Otters hold hands with their friends and family members whilst sleeping

This is so they don't drift apart, and lose each other.

This behaviour is known as rafting.

https://t.co/4skglrs098 https://video.twimg.com/ext_tw_video/1426062507962159112/pu/vid/1280x720/CgNMqG9nqsuLhbae.mp4?tag=12