The new fossil discoveries provide clues about flying, spike-toothed reptiles that lived in the Sahara 100 million years ago.

Geologists say the worm-like creature – about the size of a grain of rice – is the 1st ancestor on the family tree that contains most animals today, including humans.

Mammatus clouds can appear ominous. But, in a way that’s so common in nature, their dangerous aspect goes hand in hand with a magnificent beauty.

The oldest known bird fossil, from the age of dinosaurs, has skull features similar to modern chickens. The scientists who found it have nicknamed it “Wonderchicken.” It’s providing valuable insights into the evolution of birds.

Circumzenithal arcs have been described as upside-down rainbows or “a grin in the sky.” They’re wonderful! See photos here.

Were dinosaurs warm-blooded or cold-blooded? According to a new study that analyzed the chemistry of dinosaur eggshells, the answer is “warm.”

On February 6, weather stations recorded the hottest temperature on record for Antarctica, 64.9°F (18.3°C). The warm spell caused widespread melting on nearby glaciers

Bird-banding data in North America shows a spring migration pattern that’s become progressively earlier with each of the last 5 decades, and a fall migration that’s lasting longer than 50 years ago.

A major ocean current in the Arctic is faster and more turbulent as a result of rapid sea ice melt, according to a new study.

One hundred million years ago, a bee got trapped in tree resin. Over time, geological forces converted the resin to amber. Now a scientist arrives on the scene, to tell us this bee’s story.

Recently-discovered fossils shed new light on an enormous horned turtle that roamed South America 5 to 10 million years ago.