Hopefully this isn't old news. This is an interview with the guy in charge of all the Visual FX in the movies.

First time I've heard the name "Collosus" for the giant worm thing.

Also interesting to know they used Hong Kong fights as the basis for the 2007 movie fights and eventually got so good at it that they didn't need to see real people doing the motions.

The Art of VFX » TRANSFORMERS: DARK OF THE MOON – Scott Farrar – Superviseur VFX – ILM