FUKUOKA--Only three sea otters remain at aquariums in Japan, and they are now treated like rock stars because of their advancing years. Japan was once home to dozens of the cute mammals.

Sea otters have some of the densest coats in the world, and they require a lot of work Kelli Bender is the Pets Editor at PEOPLE. She has been working at PEOPLE since 2013. Her work has previously ...

Ken-kun has many fans among visitors to Tokyo's Ueno Zoo. His round eyes are adorable and his magnificent swimming form is utterly mesmerizing. He is an Asian small-clawed otter. Some people have ...