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Paleontologists originally thought that T. rex had three claws, but later determined that it only had two. R. Mickens/©AMNH

Study refutes claim that T. rex was three separate species

Articulated left tibia and pes

A new giant dinosaur gives insight into why many prehistoric meat-eaters...

Illustration of White Rock spinosaurid by Anthony Hutchings. Credit: UoS/A Hutchings

Europe’s largest land predator unearthed on the Isle of Wight

Andrew McAfee, Carnegie Museum of Natural History

Bizarre meat-eating dinosaur joins ‘Rogues’ Gallery’ of giant predators from classic...

Hot-blooded T. rex and cold-blooded Stegosaurus

Hot-blooded T. rex and cold-blooded Stegosaurus: Chemical clues reveal dinosaur metabolisms

Representative Image: Plesiosaur attack, artwork.

How plesiosaurs swam underwater

Genyornis eggshell recently exposed by wind erosion of sand dune in which it was buried, South Australia. Credit: Gifford Miller

First Australians ate giant eggs of huge flightless birds, ancient proteins...

Tooth size comparison between extinct Early Pliocene Otodus megalodon tooth and a modern great white shark. © MPI for Evolutionary Anthropology

Great white sharks may have contributed to megalodon extinction

Middle: Microscopic plankton cell-wall coverings preserved as “ghost” fossil impressions, pressed into the surface of ancient organic matter (183 million years old). Th

Scientists have discovered a new type of fossilization

Examples of radiolarians, a type of microplankton. These tiny lifeforms need normal salinity seawater with plenty of nutrients including silica to grow and maintain their glassy shells. Researchers at the University of Texas Institute for Geophysics found fossilized radiolarians in geologic samples dating back 56 million years, proving that life persisted in the Gulf of Mexico despite global warming that left many oceans barren. Credit: U.S. Geological Survey

Research shows how Gulf of Mexico escaped ancient mass extinction

Partial skull of Maehary bonapartei (CAPPA/UFSM 0300), left side, highlighting the maxilla. Photo: Rodrigo Temp Müller.

A new 225-million-year-old reptile from Brazil

The fossil of Jurassic lizard Eichstaettisaurus. Credit: Jorge Herrera Flores

Researchers discover overlooked Jurassic Park of lizards

The large, woody fruits of the Manicaria saccifera palm that depend on large animals for their dispersal. (Picture: John Dransfield, Royal Botanic Gardens, Kew)

Dinosaur extinction changed plant evolution

Vertebrate bones exposed during fieldwork in the Zhebao region of Guangxi ProvinceThe arrows indicate ribs, exposed in cross-section

Large Mesozoic Marine Reptile Described

An imagined scene from the end of the Cretaceous Period, more than 66 million years ago, has the newly identified softshell turtle Hutchemys walkerorum dwelling alongside iconic species from the Age of the Dinosaurs. (Image: Sergey Krasovskiy)

Newly identified softshell turtle lived alongside T. rex and Triceratops

Evidence suggests an asteroid impact that killed off most dinosaurs might have happened in spring. Credit: Joschua Knüppe

The reign of the dinosaurs ended in spring

Researchers discover first evidence indicating dinosaur respiratory infection

First evidence indicating dinosaur respiratory infection

Illustration by Cindy Joli, Julio Francisco Garza Lorenzo, and René Dávila Rodríguez.

New fossil birds discovered near China’s Great Wall – one had...

Images of different fossil remains of Abditosaurus kuehnei at the Orcau-1 site (a), the excavation process (b and c) and the neck after fossil preparation (d).

Large new titanosaurian dinosaur from the Pyrenees

True body shape of the ancient Megalodon remains a mystery. (Phillip Sternes/UCR/DePaul)

New research bites holes into theories about Megalodons

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