New ocean dwellers arrived millennia — maybe decades — after the Chicxulub impact. That forces a rethink of evolution's response to wipeout events.
Bones in the barfed-up material, which dates to a time before the dinosaurs, offer a rare peek into the diet of a prehistoric hunter.
A 66-million-year-old fossil tooth turned up alongside remains of a T. rex and ancient crocodile. This shows some mosasaurs roamed into rivers.
These fearsome predators truly were enormous — with the bone-crushing bite power to match.
Researchers employed tools of paleontology to analyze the iconic landmark — a sidewalk critter crater made when a mystery rodent fell into wet concrete.
The fossils’ fabulous colors arise from delicate assemblies of crystal plates.
Now known as Nanotyrannus, this mini dino could have roamed the late Cretaceous alongside T. rex.
Two hatchlings with broken arm bones point to ancient storms as the cause of mass casualties now preserved in Germany’s Solnhofen Limestone.
The type of calcium in those teeth points to what herbivores preferred to eat — whether soft leaves, rough twigs or something else.
