Unicorn, Not Two-nicorn

On the subject of horns, a brief rant.  I've seen variations of these meme ("Rhinos are chubby unicorns!") so many times.  I feel I can be silent no longer. 

No.  Not that I'm opposed to the joke in particular, but the picture that always goes with it.  That's a white rhino.  It has two - count them - two horns.  So, not a unicorn, which, by definition, has ONE HORN.  C'mon people, the Indian rhino (which has the word "unicorn" literally in its Latin name) is standing right there, waiting to be picked!