Tyrannosaurus rex evolved in North America, but its direct ancestor came from Asia, crossing a land bridge connecting the ...

Tyrannosaurus rex evolved in North America, specifically in Laramidia, the western half of the continent.

“I doubt that our knowledge of dinosaur evolution is good enough to be able to design a collagen gene specifically from T. rex." But researchers have found collagen in an 80-million-year-old ...