7 facts about narwhals

I drew a narwhal so why not post some fun facts about the unicorns of the sea?

1.  Their tusk is actually a tooth
2. They cannot be kept in captivity or they will die
3. The tusk can bend about a foot before it breaks
4. Narwhals can live up to 50 years old
5. Their whistles could make humans deaf
6.  Nobody knows for sure what the narwhal tusk is for
7. Narwhal babies are called calves

I hope you liked this post!!