Why do narwhals have a long tusk?
Quick Answer
The narwhal tusk is an enlarged tooth that may help with sensing the environment, social behavior, and possibly mate competition. It is most famously found in males, though some females also have small tusks.
The Full Story
The narwhal’s tusk is actually a spiralized tooth that can grow several meters long. For years, scientists debated its purpose, but evidence suggests it may help males during social interactions and may also contain sensory abilities. The tusk has nerve pathways linked to environmental sensing, which could help detect changes in salinity or temperature. It may also be used in displays and competition between males. As an Arctic mammal, the narwhal has evolved one of the ocean’s most unusual structures.
Key Facts
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