You've got it all wrong. They became extinct because of their weak hip joints. I've been resurrecting Dinos on my CNC machine at work, and they all have flimsy hip joints.
Were those with transformers or go bots? for some reason i thought about the go bots that came out when i was a kid.....they never really made it but the transformers did.Hey this just reminded me of something, how come Transformers the Movie didn't use Dino bots?
hopefully Transformers 3 will. I liked Grimlock.