The sea otter (Enhydra lutris) is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between 14 and 45 kg (31 and 99 lb), making them the heaviest members of the weasel family, but among the smallest marine mammals. Unlike most marine mammals, the sea otter's primary form of insulation is an exceptionally thick coat of fur, the densest in the animal kingdom. Although it can walk on land, the sea otter lives mostly in the ocean.

Fyn Baily aged eight at the Bloodstock festival on August 13, 2011 in Walton-on-Trent, United Kingdom. Bloodstock is the UK's largest heavy metal festival and features both established and unsigned bands over four days. (Photo by Bethany Clarke/Getty Images)

A protester holds a sign in front of riot policemen during an anti-G20 demonstration through the streets of Nice on November 1, 2011 in Nice, France. Anti-G20 demonstrators are gathered in Nice ahead of the arrival of the world's top economic leaders for the G20 summit in Cannes on November 3rd and 4th. The leaders are expected to debate current issues surrounding the global financial system in the hope of fending off a global recession and finding an answer to the Eurozone crisis. (Photo by Christopher Furlong/Getty Images)

First class seat of Emirates Airbus A380 registration A6-EDP at Munich Airport Franz Joseph Strauss on November 25, 2011 in Munich, Germany. Emirates Airlines has launched a new daily A380 service from Dubai to Munich with its first flight. (Photo by Alexander Hassenstein/Getty Images)

Hot-air balloons float over the Oka River during the Russian Sky International Balloon Festival in Ryazan Region, Russia on July 26, 2021. (Photo by Alexander Ryumin/TASS)

Rickshaw puller Shiori Yoshida, 28, attracts tourists to the guided tour at the Asakusa district in Tokyo, Japan on August 22, 2023. Pullers walk or run an average of 20 km (12 miles) a day and, in addition to being physically strong, they must have extensive knowledge of Tokyo and know how to engage with the tourists who mostly hire them for sightseeing. “I have fun and enjoy myself”, Yoshida said. “In order for the customers to enjoy themselves, I also enjoy myself”. (Photo by Issei Kato/Reuters)