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
7%
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flagthe Netherlands
8%
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34
flagItaly
5%
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17
flagAustralia
5%
5%
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17
flagthe United States
8%
7%
60%
22%
414
flagUkraine
8%
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33%
12
flagRepublic of Ireland
7%
3%
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28%
28
flagNorway
4%
8%
56%
26%
23
flagSpain
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56%
31%
16
flagPoland
10%
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55%
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10274
flagFrance
9%
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22
flagCanada
3%
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30
flagthe United Kingdom
10%
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52%
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214
flagGermany
10%
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flagIndia
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flagUnknown
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flagPakistan
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flagSwitzerland
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flagthe Philippines
28%
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14

Gender

men55%
women51%
it is a horn grown on its forehead
9%
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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