Well, did you know that cats have six?
I'll bet you didn't.
Well they do and their sixth comes from their whiskers. Now cats are able to see very well in the dark when there is a little bit of light, but when it is absolutely dark they mostly rely upon their whiskers to sense the slightest movement in the air.
A cat will also not go into any opening if their whiskers touch the sides.
This applies to all cats.
And there is your cool fact of the day.