This is a cast of a Narhwal skull and tusk. The mandible and maxilla detach, and the tooth is separate (total of 3 parts). Narwhals don't have any teeth except for the large canine tooth (or tusk) that grows outside it's mouth. The skull measures around 57.5 cm x 39.2 cm x 26.4 cm, and the mandible measures around 45.2 cm x 33.9 cm x 13.1 cm. The tusk measures at 153.4 cm in length and at 4.6 cm in diameter.