well, it seems a new Tyrannosaurus species was described today! the paper, (authored by Sebastian G. Dalman, Mark A. Loewen, and Nicholas R. Longrich) is based on remains from ancient Laramidia (now New Mexico) previously attributed to T. rex. These particular fossils are dated 6-7ish million years before T. rex. This newly proposed species, Tyrannosaurus mcraeensis, will hopefully give some insight into the evolution of T. rex, which has largely been shrouded in mystery.
The working theory has been migration from what is now Asia, *but* if T. mcraeensis continues to hold up to scrutiny it would turn out that the reverse is true! or even that a double back migration saw large tyrannosaurine dinosaurs migrate to Asia, only to migrate once again towards the northern part of North America!
Obviously the paper goes into far more detail, so i’ve included it below. give it a look!
(art at the top of the post was made by Sergey Krasovskiy)