There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
Just one thing. There is no evidence of the sex in these specimens. "Sue" and "Scotty" are just popular names and in no case are related with the sex. The idea that female were larger than male in this species was based in the predatory birds of modern days, but there is no evidence that this happened with T. rex. In fact, the only specimen that is know by its sex (female and in reproductive age) is a small specimen, not a "robust" morph.
I have not investigated T. rex to well, but the diference in size culd be clinal or maybe diferent subspecies, I am just speculationg or course. They could be only diferences of sizes in a population, or diferences in age.