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Re: Fw: late night thoughts: misunderstand what?
Andreas Johansson wrote:
Which beginning? Tyrannosaurs achieved gigantism independently from
allosaurs, for a start. Where there any really large sauro's around
when the tyrants grew big?
Not unless you include _Alamosaurus_ - which was pretty ordinary by sauropod
Hadrosaurs and ceratopsians had certainly achieved large body size by the
end of the Cretaceous. There was a considerable overlap in body mass
between Late Cretaceous titanosaurs and hadrosaurs. The biggest land
herbivores in North America during this time were probably hadrosaurs. This
might have been true for Asia too; but not South America.
Also, we have actual evidence of tyrannosaur predation upon hadrosaurs. The
caudal vertebra of an _Edmontosaurus_ skeleton shows a scar most likely
inflicted by a _Tyrannosaurus_. The wound shows evidence of healing - so
the edmontosaur was alive before and after the attack.
Sorry if I'm repeating something that was already said.
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