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Originally Posted by Ashen Key

Or maybe a pack of Deinonychus (a.k.a. the raptors from the Jurassic movies, given actual Velociraptor were much, much smaller).

I loled when I found out how small velociraptors were.
There are quite a few dinosaurs (unknown to most people) which are similar to the Jurassic Park movies though. Australia had the Rapator.

Originally Posted by Ashen Key

But you'd probably want something that could also use its arms more, which does rule out the T-Rex - T-Rex has a terrible bite, both in power (could crush a car) and as a biohazard (rotting meat in the teeth with all that bacteria = fatal bite, like the komodo dragons), but probably not agile enough on its feet.

*likes dinosaurs ? *

*Also likes dinosaurs*

Apparently though, the T-Rex (like all theropods) was built for strong speed. Not sure about it's agility, but I'd say it could go maybe 50km maximum.
And yes, it's jaws could crush a thanator's head easily. Read somewhere it could exert 25'000 lbs of force through it's jaws.

Also, for reference: theories about the Tyrannosaurus being a scavenger are pure speculation. Several wounds on other skeletons were inflicted by T-Rex's (while still alive) and it's arms may have likely been used to hold struggling prey.

For all we know, it's part scavenger, part predator.