A new study based on mathematical modeling weighs in on the fierce debate among paleontologists over the origins of the king ...

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

Around 50,000 years ago, North America was home to a diverse array ... triggered environmental changes severe enough to disrupt food chains and drive species to extinction. One of the major ...

The direct ancestor of Tyrannosaurus rex would have arrived in North America after crossing a land ... leaving “a vacuum at the top of the food chain,” according to a news release from UCL ...