Otter Learning To Swim

PB&J Otter, a Disney animated cartoon, ran from 1998 to 2000. Its main characters were otters.
Gavin Maxwell's book Ring of Bright Water tells the tale of how he brought a Smooth-coated Otter (Lutrogale perspicillata) back from Iraq and raised it in 'Camusfearna' (Sandaig), on the west coast of Scotland.
The animated Nickelodeon TV show The Penguins of Madagascar features an otter character named Marlene, voiced by Nicole Sullivan.
In the book and movie Harry Potter and the Order of the Phoenix, Hermione Granger's Patronus takes the shape of an otter.