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📘 The horn begins as an ordinary tooth

Look at a narwhal skull: the famous horn is one of two upper teeth. Usually the left erupts in males; the right stays embedded. A myth begins as anatomy.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. A tooth that escaped the jawIdentify the narwhal tusk as a modified upper tooth and explain its unusual asymmetry.The tusk usually grows from the left upper tooth, while the paired right tooth stays embedded; rare exceptions reveal how unusual development can vary.
  2. The surface can feel the seaExplain why porous tusk tissues support a sensory hypothesis without proving a single behavior.Tubules and nerve-associated tissues make environmental sensing plausible, but wild observations are needed to connect anatomy to decisions.
  3. A social signal in a cold oceanCompare sexual selection, tusking, and prey handling as overlapping explanations.Male-biased size patterns support signaling and contests, while tusking and filmed prey strikes show that the tusk can also act in encounters and feeding.
  4. Ice, memory, and a human storyConnect narwhal geography, Inuit knowledge, historical belief, and open scientific questions.The tusk carries biological evidence and human history; combining local knowledge, fieldwork, and anatomy keeps the mystery precise rather than magical.

Questions this course answers

Why is calling the narwhal tusk a horn misleading?

The tusk grows from the upper jaw and contains tooth structures such as dentin and nerve-associated tissue.

Match each observation to the hypothesis it supports.

Different kinds of evidence point toward different possible functions, and the functions may overlap.

Why does evidence for sexual selection not rule out sensory function?

Evolution does not require a visible trait to perform only one job; the data support a social role while leaving other roles open.

Put these steps in the logic of investigating the tusk in order.

Researchers move from anatomy to mechanism to behavior, then weigh which hypotheses best fit the combined evidence.

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