I think PaulYukochan might have nailed the answer there. Or maybe it's the knee joint of the back legs, cos i can't think of another animal where the back legs bend that way. 'Cept for us humans that is. Unless a Rhino has the same kind of legs as an Elephant!
Well I know this point has been made at least twice and already discarded, but I swear that elephants are the only other creatures with knees that operate like humans' (not to say that you mightn't have seen some squirrels with specially adapted stilts or something :p). More to the point, I have to say that I doubt Starbucks would launch any competition where the answer was 'mourn the dead' and the prize a chocolate coin! Most interesting responses though!