Why do narwhals have a giant tooth on their face?

Narwhals possess a long, spiral tusk, which is actually an elongated tooth, primarily found in males. This tusk is believed to play a role in social interactions, mating displays, and establishing dominance among males. Additionally, it may serve as a sensory organ, helping narwhals detect changes in their environment. The tusk's unique shape and function have made it a subject of fascination and research in marine Biology.