Can you have a mermaid or merman in Zoo Tycoon?

There used to be a way, but now there is none. You used to be able to buy them in the drop down menu for 2,500 dollars, but now you can't. I have mermaids in my zoo, but no mermen. I'm sorry. People say to make a guest's name Foringus Loringus, but it won't work, and no other cheats I find will. Sorry there is no way.

~Mythical Marvels - A Zoo of Wonder