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) long, 1.5 m (4.9 ft) tall at the hips and 280 kg (620 lb) in weight . . . " SO, utahraptor is to salon what velociraptor is to f36! And we'd still runaway! Am I right? Thanks for the well-written, informative piece and comments. Best wishes.