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T.rex running speed

Before we get too far into another long and convoluted thread, could I
suggest that discussion be confined to possible safety margins in predators
only. High speeds in a prey animal presumably develop in order to more
efficiently escape a pursuing predator - in this case a safety margin seems
pretty pointless -what is more fatal, falling at high speed, or being caught
and eaten? Doesn't seem much point then, with all respect, to be comparing
giraffes with T. rex. It might make sense for T. rex to have a safety
margin, but modern comparisons, if there are any, should come from animals
in a similar position in the food chain, IMHO.
Graeme Worth