Baby Otters

The word otter derives from the Old English word otor or oter. This and cognate words in other Indo-European languages ultimately stem from the PIE root wódr̥ which also gave rise to the English word water.
An otter's den is called a holt or couch. A male otter is a dog, a female a bitch, and a baby a whelp, kit, or pup. The collective nouns for otters are bevy, family, lodge or romp, being descriptive of their often playful nature, or when in water raft.