@.extremenature: The Whale With a 3-Meter Tusk That Isn’t a Weapon (Narwhal) In the Arctic, this whale carries a 3-meter spiral tusk. But it isn’t used to fight. The narwhal’s tusk is a sensory organ filled with millions of nerve endings that detect temperature, pressure, and salinity in real time. A tooth that reads the ocean. Did you know some animals can “feel” the environment using structures that look like weapons? Follow for more extreme creatures from the depths. #OceanScience #MarineBiology #Narwhal #Educational #NatureDocumentary