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RE: Trex size and pack-forming (was Tyrannosaur age-popula...)

I was just reminded of lions and tigers, two of our largest predators which
would look very similar in a fossil record (like, say, T rex and
Tarbosaurus? Albertosaurus?) - one is solitary, the other in a pride. The
only point I guess is that it would be tricky to generalise with even closel
related fossil predators I guess