This narwhal skull has double tusks, a rare trait in narwhals. Usually, males have a single long tusk, the canine on the left side of the upper jaw.
This two-tusked Narwhal skull is a rare example, as males usually only have one. Narwhals are toothed-whales and in males, one tooth erupts as a long tusk. In rare case, both front teeth erupt, giving two tusks. Each tooth/tusk was a little under 2m long. Hunde Island, Greenland
Photo credit: Tim Melling