Hi. In the Jurassic Park 3 movie, T.Rex and Spinosaurus have a fight. While I agree with your theory that if Spinosarus grabbed hold of T.Rex it would have probably killed it, at the start of the fight the T.Rex gets in the first move, biting Spinosaurus on the neck. If this really happened in real life wouldn't the T.Rex have killed the Spinosaurus? T.Rex's jaws were probably the most powerful of the big carnovores and its teeth were curved for crushing, so is it unrealistic that Spinosaurus would remain unscathed after being bitten on the neck? Also, were Spinosaurus' teeth really that much bigger than T.Rex's in reality?
from Neil.S, age 15, ?, ?, England; July 22, 2001

TOM: Yes, if a T. rex did grab the Spinosaurus by the neck (as shown in the movie), the Spinosaurus should have been killed. It would certainly have been seriously hurt even if it did manage to break free, as you note.

No, the teeth of Spinosaurus and T. rex are very similar in size, although not shape. It is true that the teeth in the front of the snout of Spinosaurus, which are its largest, are much much bigger than the front teeth of a T. rex, which are its smallest. However, the biggest teeth in a T. rex skull are about the same size as the biggest teeth in Spinosaurus.