Because of their high blubber content, the North Atlantic Right Whale floats when it dies. This made it ideal for whalers to hunt as they did not have to haul the whale onto the ship to collect the whale oil. By the 1930’s these whales were hunted to near extinction, with only a mere 100 whales left. In 1937 a global whaling ban took effect. Though largely successful, pollution, ship collisions, fishline entanglement and global warming has not helped this species recover, and remains an endangered species.