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.

A new tyrannosaur species named Thanatotheristes, which means “reaper of death,” was the apex predator of its time, 79 million years ago in present day Alberta, Canada.

January 2020 was the planet’s hottest January in the NOAA global temperature dataset record, which dates back to 1880.

Scientists raced against a rising tide to recover a tantalizing fossil on an island in southeast Alaska. It turned out to be a species new to science.