sea otter

With its furry coat, friendly face, and playful nature, the sea otter is perhaps one of the most endearing animals in the sea. But these marine mammals are more than cute; they're fascinating creatures with unusual behaviors and great intelligence. Unfortunately, this graceful swimmer was once most valued for its thick fur and was almost hunted to extinction.

Image credits: main image, © Suzi Eszterhas/AGE Fotostock.