Otters rely on air-pockets trapped in their fur to keep themselves warm in the cold waters where they live. Otters live all over the world in rivers, lakes, and oceans. Most species hunt for 3 to 5 hours a day. Otters can whistle, growl, scream, bark, chirp, and coo.
I love watching the sea otters at the Seattle aquarium where you can see them from above the water and from the side in the water.
Otters appear in fiction. One of my favorite representations is in Brian Jacques’ Redwall books. In the famous Harry Potter books, an otter is Hermione Granger’s patronus.