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
flagSweden
10%
0%
70%
20%
20
flagAustralia
5%
5%
68%
15%
19
flagthe Netherlands
7%
2%
64%
25%
39
flagthe United States
8%
6%
60%
22%
458
flagNorway
3%
6%
60%
26%
30
flagSwitzerland
0%
15%
57%
26%
19
flagPoland
9%
5%
56%
28%
13593
flagthe United Kingdom
9%
4%
56%
28%
281
flagFrance
8%
4%
56%
30%
23
flagSpain
0%
12%
56%
31%
16
flagItaly
13%
0%
54%
31%
22
flagRussia
9%
9%
54%
22%
22
flagCanada
3%
6%
53%
36%
30
flagCroatia
0%
0%
52%
47%
17
flagGermany
10%
2%
51%
34%
139
flagIndia
13%
14%
50%
21%
128
flagRepublic of Ireland
10%
7%
50%
30%
40
flagUkraine
4%
8%
50%
33%
24
flagUnknown
9%
4%
49%
36%
542
flagthe Philippines
22%
11%
44%
16%
18

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
33%
33%

Details

Author: Betty
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