Otters are carnivorous mustelids in the Lutrinae subfamily. There are 13 ＿＿（11）＿＿ species of otters around the world, one of which is native to the UK. But now let's focus on two species in other areas. One is the Eurasian otter. This species is the most widely distributed of all the otters, ＿＿（12）＿＿ through Eurasia up to the Arctic Circle, from Ireland to Kamchatka, and south to North Africa, Sri Lanka and Indonesia. Their varied and 13 diets mean they may inhabit any unpolluted body of fresh water, including lakes, streams, rivers, and ponds, as long as there are adequate food supplies. The other is the Sea otter. It is found most often in areas with protection from the most severe ocean winds, such as rocky coastlines, thick kelp forests, and barrier reefs. Sea otters are native to the coasts of the northern and eastern North Pacific Ocean. Currently stable ＿＿（14）＿＿ exist in parts of the Russian east coast, Alaska, British Columbia, Washington, and California, with reports of recolonisations in Mexico and Japan. ＿＿（15）＿＿ they typically forage alone, sea otters tend to rest together and link arms in single-sex groups called rafts. A raft typically contains 10 to 100 animals, but the largest raft ever seen contained over 2000 sea otters.