Did you know (nature trivia)

ArcticFox

There is a whale with a tusk called a Narwhal?

We had guests over and I was telling DD about the narwhal, I think she was talking about unicorns.

One of our guests gave me this look (older woman) and was like, "I didn't know that".  I honestly think for a minute that she thought I was making up some cool story for my kids.

Just curious if you knew that.  I was surprised to get this look like I was talking like a crazy person!  (No judgement, just surprise.  I have a MS in Natural Resource Management, so I should know this stuff).