When you picture a dinosaur, what does it look like? For Jingmai O'Connor, paleobiologist and associate curator of reptiles at the Field Museum of... Birds are dinosaurs. Here's how scientists know ...

For more than 100 years, researchers assumed that dinosaurs were like giant lizards: sluggish reptiles that spent most of their day basking in the sun. This image changed when we started to realize ...

Archaeopteryx lithographica inhabited the Earth in the late Jurassic period, around 150 million years ago. Yet evidence of the species’ existence is constantly fluttering about: birds. “Dinosaurs Take ...

If you’re like us, you’ve probably held both of these seemingly competing ideas in your head at the same time and were too scared to ask for clarification, for fear of being silly. With that in mind, ...

We’ve known for a long time that birds are the closest living relatives of dinosaurs, but new clues are shedding light on a transitional phase in how feathers came to be. Feathers are one of nature’s ...

It took an awful lot of clever adaptations to the produce common bird. It’s got to be light, so you give it hollow bones. It’s got to be strong, so you give it less a breastbone than a keel, to which ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Death in the wild ...

When you picture a dinosaur, what does it look like? Maybe you think of four-legged herbivores like Apatosaurus or Triceratops. Maybe you imagine large armored dinosaurs like Ankylosaurus or ...