The sociable River otter is a semi-aquatic mammal that lives in family groups along the water's edge, typically around rivers and lakes. When you see a family of otters on land, it is called a romp, while a family of otters in the water is referred to as a raft.
“Aquatic Mammals - River Otter.” Florida Fish And Wildlife Conservation Commission, Florida Fish And Wildlife Conservation Commission, myfwc.com/wildlifehabitats/profiles/mammals/aquatic/river-otter/#:~:text=This%20water%2Dloving%20animal%20is,or%20remodel%20a%20beaver's%20burrow.