Population sizes of T. rex cannot be precisely estimated

Marshall et al. recently estimated population densities, range sizes, instant and cumulative total sizes for Tyrannosaurus rex with narrow ranges of uncertainly. I revisit the assumptions that led them to these conclusions show many parameters are associated much wider margins error than they estimated. Biogeographic estimates seem have been especially unrealistic, seriously hampering effort calculate level parameters. posit biogeographic ecological uncertainties make it extremely unlikely be able estimate long-extinct species.