do the others look like animals cause i dont really see it? cept for bumbleebee for obvious reasons. you said he looks like a bull which is true but i remember when me and my friend first saw the movie in the theatres, ironhide came on screen and she said "omg he's looks like a cat bot!" XD
Check out Ratchet he reminds me of a walrus and masked Prime has a very eagle-like look. The decepticons look like reptilian and insects. Of course with everything it may be a little loose or very heavy on look of the animals.