Explaining Nature on Instagram: "Otters are playful, intelligent mammals that belong to the weasel family, found in both freshwater and marine environments around the world. They have sleek, streamlined bodies, webbed feet, and dense waterproof fur that keeps them warm in cold water. There are 13 species of otters, ranging from the small Asian small-clawed otter to the large sea otter of the Pacific coast. Sea otters are especially known for their clever use of tools — they often use rocks to cr