I always wondered why the above butterfly is called a question mark, and why a very similar butterfly is called a comma.
I was looking through butterfly photos I had taken recently when it hit me. The underside of this beautiful butterfly is brown and drab. However here are two small white markings on the underside that can be construed as a question mark. On the other butterfly, there is only the longer white marking, and thus it is called a comma. (I verified this on line!)
Can you see the question mark?