Although they came into their own only after the extinction of the dinosaurs some 65 million years ago, mammals had maintained a low-profile existence for some 150 million years before that.

But, alas, the mosasaurs were not dinosaurs. As with plesiosaurs, the biggest giveaway is its habitat: “With the exception of ...

The evolution of mammals has been marked by significant events, such as the mass extinction that wiped out non-avian ...

Paul says, 'Sauropods were the only group that were heavier than the largest land mammals. 'Interestingly, theropod dinosaurs such as Spinosaurus and T. rex were also the only animals to exceed the ...

What if 65 million years ago a meteor had not struck Earth, contributing to the extinction of the dinosaurs? In 1982, ...

Before the asteroid hit, Steve described mammals as “staying and diversifying in the shadows” while dinosaurs “eventually took over from the crocodiles, got bigger and spread around the ...

Faced with an evolving group of competing organisms -- the mammals -- perhaps dinosaurs were driven to extinction by competition. Packs of small mammals would have competed with dinosaurs for food.

As white Americans moved further westward into the Nebraska territory after the Civil War, they kept fashioning a new American identity based on deep time. Digging deep into the ground to anchor the ...

including large crocodile relatives - both terrestrial and semi-aquatic - and various plant-eaters including elephant-sized ones related to mammals and four-legged armored reptiles. "Dinosaurs ...

The earliest known mammals were the morganucodontids, tiny shrew-size creatures that lived in the shadows of the dinosaurs 210 million years ago. They were one of several different mammal lineages ...