I think t-rex is big, slow, pondering, settles for lazy carrion or an easy catch. Scarily HEEEUGE(!) is its one impressive trick, so it's no utahraptor, for example. From Wikipedia, "In 2016 Rubén Molina-Pérez and Asier Larramendi estimated the largest specimen (BYU 15465) at 4.65 m (15.3 ft)...