This week is Sea Otter Awareness Week, an event that draws attention to these fluffy floating mammals. The otter featured in today"s image was photographed in Prince William Sound, Alaska, United States. Sea otters are native to the northern and eastern coasts of the North Pacific Ocean. Weighing 14 to 45 kilograms, they"re expert foragers, diving to the seabed to find food. These clever critters are smart as well as cute: they use rocks to crack open shellfish, making them one of the few animals that use tools. There used to be as many as 300,000 in the wild, but they were heavily hunted for almost two centuries, as their dense fur was highly prized.