Bloodthirsty Lizard

A recent visit to the Hartebeespoort Dam Snake and Animal Park led to the discovery of a rather unusual sign.

(I apologise for the really awful quality of the photo. I forgot my camera at home and had to make do with my cellphone)

EASTERN BLUE TONGUED LIZARD
Tiliqua scincoides

A common lizard in Eastern Australia growing to a maximum length of over 30cm. Aptly named because of their tongues which is bright blue in colour. They kill many people on a regular basis by attacking motor vehicles travelling at high speeds. If you come across this lizard in your car and do not wish to be killed - slow down and act dead! Their diet consists of cars and occasionally they attack trucks as well. By now you are well aware that you are not safe standing here looking at this vicious animal for it can easily break through the 5mm viewing glass - have a nice day!

It is definitely a prank, but whether it was done by the staff or a by visitor remains a mystery.
After all, how many people really read much more than the name if the animal inside looks like this?