Recovering from knee-replacement surgery, Colorado teacher Kent Hups spotted a peculiar shape in a North Dakota valley. Researchers say the four-footprint sequence may be the first known trackway likely left by an adult T. rex.
Researchers estimated T. rex’s body temperature at about 97°F by studying chemical bonds in fossil tooth enamel. The result gives a famous dinosaur a surprisingly familiar number.
Over a thousand dinosaur species once roamed the Earth. Learn which ones were the largest and the smallest, what dinosaurs ate and how they behaved, as well as surprising facts about their extinction.
