Narwhals are well adjusted to the arctic marine environment in which lock live. Narwhals have a streamline body v two dorsal flippers and lack a dorsal fin. Propulsion originates from their tail. They have actually a special layer that blubber to defend their bodies from the cold (Williams et al. 2011).
their bodies room specially adjusted for deep dives. Narwhals have a compressible rib cage the s
The clinical name because that narwhal, Monodon monoceros, way “one tooth”, “one horn” (Heide-Jorgensen & Garde 2011). This name refers to the narwhal’s many recognizable feature, the tusk. Unlike other toothed whales, narwhals only have actually two teeth. These two teeth space both in the top jaw. In males, the appropriate tooth typically remains tiny and go not flourish out that the mouth, while the left this grows right into a tusk that have the right to be 3 meters long (Curry 2010). A small percentage the males have actually two tusks, in i beg your pardon both teeth have grown right into tusks, known as "bidental" narwhals. The tusks are spiraled v a respond to clockwise rotation, loved one to the narwhal (Curry 2010).Ordinarily, females absence tusks. The objective and duty of your tusks has been extensively speculated. Originally, it was believed that the tusks aided them hunt because that food, or break breathing feet in the ice cream (Curry 2010). Today, researchers think that the tusks are essential in sex-related selection. Because that example, the narwhal v the biggest tusk would can mate very first (Curry 2010). Other researchers think that the tusk is likewise filled with neurons and sensory cells that aid the narwhal identify the problems of its environment (Curry 2010; Williams et al. 2011).
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This would certainly be advantageous to the narwhal throughout deep dives where there is no light and also hunting would certainly be generally done through touch (Laidre 2004).