Long Limbs Helped Propel T. Rex Up the Dinosaur Food Chain

FILE -- A model of a Tyrannosaurus rex skeleton, part of the “T. rex: The Ultimate Predator” exhibit at the American Museum of Natural History in New York, March 1, 2019. The apex predator wasn’t a quick runner because of its heft, but its lanky limbs ensured it could amble efficiently for hours. (George Etheredge/The New York Times)