Narwhals are a species of toothed whale that are most closely related to the beluga whale. The males have evolved an extra long left canine tooth that can grow up to 2.7 meters or 9 feet long and bursts through the upper lip and protrude from the head like the horn of a unicorn. In a research published in PLOS One, it was revealed that narwhals have the most directional sonar of any species on Earth.
Scientists from the Woods Hole Oceanographic Institution have made the first-ever field observations of Omura's whales, which occured off the coast of Madagascar. This study sheds light on the rare species' behavior and habitat preferences.