Dino-Xenomorph Hybrid

Hello there. I've been spending a great deal of time bouncing back and forth betwen this site and the Prometheus forums and, well, I've developed a bit of a fanciful notion. Please, humor this girl's nonsense for a moment. What dinosaur would you like to see as the basis for a Xenomorph organism? Let's say there was an outbreak of Facehuggers some 72 Million years ago and all sorts of terrible things began clawing their way out of dinosaur chests! As always, your thoughts are appreciated, even if you choose to keep them to yourself. :)