The abyssopelagic zone is located between 4000m and the ocean floor. It is near freezing, with no light, and extreme water pressure. Most creatures that live there are invertebrates that survive in the cold, dark conditions. Some notable animals found in this zone include the dumbo octopus, which uses its large fins to swim, the frilled shark, with over 300 teeth and a flexible jaw, and hammerhead sharks that hunt at night in schools.