Bizarre Spinosaurus makes history as first known swimming dinosaur. A newfound fossil tail from this giant predator stretches our understanding of how—and where—dinosaurs lived.

Then, a six-mile-wide asteroid struck Mexico’s Yucatán at 43,200 mph, releasing energy beyond all human-made explosives combined and reshaping life on Earth. Unlike many species that survived the ...

The big sky country of the western North America is a world-renowned dinosaur playground. Household-name dinosaurs like ...

Yale University ecologists reveal a lizard lineage that rode out the dinosaur-killing asteroid event with unexpected ...