Even-toed ungulates
Common hippopotamus
Carnivores
African clawless otter
Cameroon clawless otter
North american otter
La plata otter
Huillin
Common otter
Speckle-throated otter
Hairy-nosed otter
Indian smooth-coated otter
Giant brazilian otter
Dolphins, porpoises, and whales
Blind river dolphin
Rodents
Setzer's pygmy mouse
Dugongs, manatees, and sea cows
American manatee
African manatee
Read more at the list of biomes of the world...