The narwhal is a medium-sized whale found primarily in the Arctic waters. Known for its long, spiral tusk, which can reach lengths of up to 10 feet, this tusk is actually an elongated tooth. Narwhals are social animals, often found in groups called pods, and they primarily feed on fish and squid. These marine mammals are well-adapted to their cold environment, with a thick layer of blubber for insulation. Narwhals can dive deep, reaching depths of over 1,500 meters, to hunt for food. They are also known for their unique vocalizations, which help them communicate in the icy waters.