"WA values its honest Kangaroos, Emus and Echidnas. Not so the stunted deformed Wallabies." -@archiearchive
Accompanied by the following photograph:
It's an interesting interpretation, certainly, but it's dead wrong.
The fact is that WA recognises that motorists only need to be warned to watch out for animals stupid enough to blunder into a moving vehicle. The wallaby omission is only recognising their superior intelligence.