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.
reach: rather globalanimalsarctic animalsmammalsnaturesea animalssea mammalsteethzoology
Answers by country
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
Armenia
23
Sweden
36
Republic of Ireland
31
Italy
22
Australia
62
the United Kingdom
253
the United States
655
Greece
26
India
360
Poland
16496
Russia
259
Canada
29
the Philippines
29
Belarus
57
Ukraine
525
Kazakhstan
41
Austria
117
Germany
598
Pakistan
32
Switzerland
72