i think.......
fish is the american term for donk and donk is australian imho both mean the same thing fish and shark seem more efficient as you have both ends of the spectrum . Besides, who wants to eat a donkey? and what could? SHARKS gobbling up fishies is better so lets ban the word DONK and keep it evolutionary with the weak being eaten by the strong,
donkeys are sterile too so its a cruder insult .....wait a minute, im not biologist/genetecist....
DONK IS BAD.............SHARK IS GOOD...................END OF STORY