Holy Cows!!

So we got the opportunity to do these stampeding cows and boy, they are moooovin.. (yes, pun very much intended..) 
My work was skin simulation using cloth -- can you guess which ones are real and which are fake?
(trick question.. they're all CG) 
Fun fact: A network television station required an affidavit stating these were not real cows and no actual cows were abused or hurt on this commercial.