What is narwhal 'horn' really made of?

it is a horn grown on its forehead
it is an adapted scale
it is a canine tooth
it is an adapted nose bone
Usually, males have a single long tusk, the canine on the left side of the upper jaw that projects through the lip and forms a left­-hand­ed helix. The tusk grows through­out life reaching length of 3 m (10 ft). In some rare cases, both canines grow equally long, forming two tusks. In the Middle Ages, narwhal tusks were sold as unicorn horns.

Answers distribution

it is a horn grown on its forehead
it is an adapted scale
it is a canine tooth
it is an adapted nose bone
answers
flagBelgium
9%
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9%
11
flagSweden
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flagItaly
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flagAustralia
5%
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flagthe Netherlands
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flagUkraine
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flagthe United States
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flagRepublic of Ireland
7%
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27
flagNorway
4%
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23
flagPoland
10%
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flagCanada
3%
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flagSpain
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flagUU
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flagFrance
9%
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flagthe United Kingdom
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flagIndia
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flagGermany
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flagPakistan
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flagSwitzerland
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flagthe Philippines
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Gender

men55%
women52%
it is a horn grown on its forehead
8%
8%
it is an adapted scale
5%
6%
it is a canine tooth
55%
52%
it is an adapted nose bone
29%
32%

Details

Author: Betty
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