Sea otters are perhaps the cutest animals in the ocean. Readers will agree when they set their eyes on photographs of these fascinating mammals trying to survive in the icy waters of the North Pacific Ocean. These friendly animals have the densest fur in the world, an adaptation that both helps them keep warm yet hurts them as fur traders overhunted them. Today, the sea otter population is fighting for its life. Readers will find out what people are doing to help them.