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Otters are carnivorous mammals in the subfamily Lutrinae.
Mammals are any vertebrates within the class Mammalia, a clade of endothermic amniotes distinguished from reptiles and birds by the possession of a neocortex, hair, three middle ear bones and mammary glands.
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The 13 extant otter species are all semiaquatic, aquatic or marine, with diets based on fish and invertebrates.
A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits.
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity.
Invertebrates are animals that neither possess nor develop a vertebral column, derived from the notochord.
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Lutrinae is a branch of the weasel family Mustelidae, which also includes badgers, honey badgers, martens, minks, polecats, and wolverines.
Mink are dark-colored, semiaquatic, carnivorous mammals of the genera Neovison and Mustela, and part of the family Mustelidae which also includes weasels, otters and ferrets.
The wolverine, Gulo gulo, also referred to as the glutton, carcajou, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae.
The Mustelidae are a family of carnivorous mammals, including weasels, badgers, otters, ferrets, martens, minks, and wolverines, among others.
