Sea otters are marine mammals found along the coasts of the North Pacific Ocean. They have thick fur, which keeps them warm in cold waters, and they can weigh between 50 to 100 pounds. Sea otters are known for their playful behavior and often use tools, such as rocks, to crack open shellfish. These animals play a crucial role in their ecosystem by helping to maintain kelp forest health. By eating sea urchins and other herbivores, sea otters prevent overgrazing of kelp, which provides habitat for many marine species. Their conservation is important for ocean biodiversity.