RE: Nemegtian Tyrannosaurs

[MarkSabercat@aol.com]

In a message dated 5/4/03 11:20 : EDT Dinogeorge wrote:

<<This all seems like explanations piled on explanations and speculation 
piled on speculation. Maybe this, maybe that. Perhaps this, perhaps that. The 
most 
parsimonious explanation would be that T. bataar is a different species than 
T. efremovi and that both are different genera from T. rex.>>

But with all due respect, this isn't really any more of an explanation, it 
simply further begs the question of why there seems to be differential 
mortality 
or preservation biasis. Granted that the posts on this subject have to date 
been pretty speculative, but we have to start with something in order to begin 
trying out ideas that can later be proven or disproven as we get better 
evidence. I'd like to see some input from field biology studies, if they exist, 
on 
the differential mortality of juvenile among extent, carnivorous bird and 
mammal populations in continental vs. marine dominated climates; we have to be 
careful of undue extrapolation from very different animals, but it might help 
us 
come up with some reasonable hypotheses. 

--Mark Hallett