A narwhal is commonly referred to as the "unicorn of the sea." This nickname arises from its distinctive long, spiral tusk, which is actually an elongated tooth. Narwhals are medium-sized whales native to Arctic waters and are known for their impressive tusks, which can grow up to 10 feet long. These animals exhibit unique adaptations for living in icy environments, including their ability to dive deep in search of food. The narwhal has captured human imagination, inspiring legends and symbolism throughout history.