A River Otter is any of 13 living species of semi-aquatic, (or in the case of the sea otter: Aquatic) mammals that feed on fish & shellfish; also other invertebrates, amphibians, birds and small mammals. An otter's den is called a
Surprising fact: baby otters actually need to be taught how to swim! Not so surprising fact: the process is obscenely adorable! In March we brought you incredible pictures of the Columbus Zoo's newest baby otter kits.