Share this on WhatsApp Deep beneath the frozen surface of the Arctic swims a sea unicorn. In reality, it’s a whale with a spiral tusk sprouting from its head—the narwhal. Biologists have long debated the purpose of male narwhals’ tusks. The tusk, like those of elephants, are actually elongated teeth. And since narwhals are usually … Continue reading What’s a Narwhal’s Tusk For?