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For Asiatic lionesses, sex may be a way of protecting their cubs from murderous males.

Nala Rogers, Staff Writer

image shows a round, brown fossil of an ancient organism known as aspidella.

Fossils dating more than about 540 million years old are extremely rare. That's why a newly discovered ancient deposit is so valuable.

Christian Fogerty, Contributor

Study suggests parts of the animals' backs and legs fused together to form wings.

Charles Q. Choi, Contributor

Wormlike amphibians called caecilians may have evolved venomous teeth long before the first snakes crawled the Earth.

Charles Q. Choi, Contributor

Close up image of rust-colored fox, taken from above, as the animal looks into the camera

Some evidence suggests that foxes may be trying to domesticate themselves.

Joel Shurkin, Contributor

Image shows a hand holding a piece of slate with a fossil, with mountains in the background.

New discovery could help scientists unearth more ancient microbial fossils and shed light on some big questions about early life on Earth.

Meredith Fore, Contributor

Hummingbirds can distinguish blends of color that we see as ordinary hues.

Charles Q. Choi, Contributor

Many dinosaurs gathered together in a scene showing predators, prey and scavengers

Prehistoric remains also reveal signs of a particularly large predator.

Joshua Learn, Contributor

A mysterious video shows worms fighting and dancing the "jitterbug."

Nala Rogers, Staff Writer

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