The gangly predator fills in a crucial gap in our understanding of how tyrannosaurs came to dominate during the Cretaceous.

AUBURN, Wash. (AP) — Spectators cheered as participants ran down the track cloaked in inflatable Tyrannosaurus rex costumes during the T-Rex World Championship Races at Emerald Downs in Auburn, ...

Racers take to the track during a preliminary heat during the "T-Rex World Championship Races" at Emerald Downs, Sunday, June 29, 2025, in Auburn, Wash.

Spectators cheered as participants ran down the track cloaked in inflatable Tyrannosaurus rex costumes during the T-Rex World Championship Races at Emerald Downs in Auburn, Washington.

Racers take off during a preliminary heat during the "T-Rex World Championship Races" at Emerald Downs, Sunday, June 29, 2025, in Auburn, Wash. (AP Photo/Lindsey Wasson) Credit: ASSOCIATED PRESS ...