These were large animals that usually weighed over ... posing challenges for mammals to gain their sizes. After the dinosaurs died out, mammals evolved into many different shapes and sizes as ...

"Many of them had feathers, [so] they could insulate themselves just like mammals can," Brusatte said. In addition, some ...

Birds are inextricably linked to feathers, which allow them to fly, keep warm and put on dramatic displays. Feathers, however ...

Dinosaurs long dominated Earth's land ecosystems with a multitude of forms including plant-eating giants like Argentinosaurus, meat-eating brutes like Tyrannosaurus and weirdos like Therizinosaurus, ...

Archaeopteryx, long considered the earliest fossil bird, could be knocked off its perch by Baminornis zhenghensis, which lived around 150 million years ago and had a short tail like those of modern bi ...

Dinosaurs evolved from more primitive reptiles in the ... Dinosaurs initially were overshadowed by other animals, including large crocodile relatives - both terrestrial and semi-aquatic - and ...

The extinction of dinosaurs about 65 million years ago helped create an environment where fruits could thrive, leading to the ...

The extinction of the largest dinosaurs to walk the Earth may have played a critical role in creating an environment that ...

In just a few years, according to this hypothesis, these frigid and sweltering climatic extremes caused the extinction of not just the dinosaurs, but of up to 70 percent of all plants and animals ...