"what in the fuck is that horn for?"
"...the helix-shaped tusk of the narwhal, or “unicorn” whale has proved to be an extraordinary sensory organ... Measuring up to 2.7 meters or about 9 feet long, the tusk is traversed by up to 10 million nerve pathways. These pathways connect the outside of the tusk to a central core of nerves leading to the animal’s brain... the tusk’s sensory system may be capable of detecting changes in temperature, pressure, salinity and other factors that may help a narwhal survive its Arctic environment."