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Evolution

Some male animals may evolve weak immune responses so they can give their mates diseases.

Nala Rogers, Staff Writer

Newly-discovered fossil deposit contains more than 50 unknown species from the Cambrian Explosion, when most complex body plans appeared.

Charles Q. Choi, Contributor

Indoor temperature and moisture in the U.S. is closer to climates in Africa than to anywhere else on Earth.

Nala Rogers, Staff Writer

When the foraging sea mammals crack shells to collect food, they produce distinctive evidence.

Thomas Garlinghouse, Contributor

Ancestors of modern humans may have scavenged calorie-rich bone marrow from already dead animals.

Thomas Garlinghouse, Contributor

New research suggests the ancestors of reptiles, birds and mammals might have walked more efficiently on land than previously thought.

Charles Q. Choi, Contributor

Long penises may allow hermit crabs to stay in their shells during sex, reducing the risk of shells being stolen.

Nala Rogers, Staff Writer

Two well-preserved fossils found in China were covered in both furlike pycnofibers and featherlike features.

Charles Q. Choi, Contributor

New research may explain why some cloven-hoofed animals have tusks instead of horns or antlers.

Nala Rogers, Staff Writer

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