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
flagAustralia
4%
4%
71%
14%
21
flagRussia
8%
5%
70%
13%
37
flagSweden
8%
0%
69%
21%
23
flagthe Netherlands
7%
2%
65%
25%
40
flagthe United States
8%
6%
60%
22%
479
flagSwitzerland
0%
15%
60%
25%
20
flagNorway
3%
6%
59%
28%
32
flagthe United Kingdom
9%
4%
57%
27%
301
flagPoland
9%
5%
56%
28%
14268
flagCanada
3%
6%
56%
34%
32
flagFrance
8%
4%
56%
30%
23
flagSpain
0%
12%
56%
31%
16
flagGermany
9%
2%
52%
33%
142
flagItaly
13%
0%
52%
34%
23
flagCroatia
0%
0%
52%
47%
17
flagUkraine
3%
6%
51%
34%
29
flagRepublic of Ireland
10%
7%
50%
30%
40
flagUnknown
9%
4%
49%
36%
561
flagIndia
14%
13%
49%
21%
141
flagthe Philippines
22%
11%
44%
16%
18

Gender

men52%
women52%
it is a horn grown on its forehead
9%
7%
it is an adapted scale
5%
6%
it is a canine tooth
52%
52%
it is an adapted nose bone
33%
32%

Details

Author: Betty
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