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
5%
5%
68%
15%
19
flagSweden
11%
0%
66%
22%
18
flagIsrael
6%
0%
66%
20%
15
flagthe Netherlands
8%
0%
63%
27%
36
flagthe United States
8%
6%
60%
22%
443
flagNorway
3%
6%
60%
26%
30
flagRussia
10%
10%
60%
20%
20
flagItaly
14%
0%
57%
28%
21
flagPoland
9%
5%
56%
28%
13185
flagthe United Kingdom
9%
4%
56%
27%
263
flagFrance
8%
4%
56%
30%
23
flagSpain
0%
12%
56%
31%
16
flagUkraine
5%
0%
55%
35%
20
flagCanada
3%
6%
53%
36%
30
flagCroatia
0%
0%
52%
47%
17
flagGermany
10%
3%
50%
34%
132
flagIndia
11%
14%
50%
22%
115
flagUnknown
9%
4%
48%
36%
520
flagRepublic of Ireland
10%
7%
48%
30%
39
flagthe Philippines
25%
12%
43%
12%
16

Gender

men52%
women51%
it is a horn grown on its forehead
9%
8%
it is an adapted scale
5%
6%
it is a canine tooth
52%
51%
it is an adapted nose bone
32%
33%

Details

Author: Betty
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