John B. Calhoun's mice had unlimited food, no predators and space to spare. Their population still collapsed into castes and died out — here's what it proves.

Spiders may seem to be the scariest household invaders, but maybe they aren't after all. These are just some of the reasons ...

About 200 million years ago, furry, little egg-laying creatures evolved the ability to feed their offspring with a secretion from special glands: milk. Their evolutionary journey continued, and by ...

These early mammals looked like shrews do today. They were small and had a long body, eyes typical for nocturnal mammals and ...

The platypus is already an animal that seems assembled from spare parts: a duck-like bill, a beaver-like tail, webbed feet, dense waterproof fur, and eggs where most mammals produce live young. Less ...

A dramatic new interpretation of thylacine anatomy has discovered that the extinct Tasmanian tiger killed prey more like a ...

The Tasmanian tiger hunted more like a fox than its fearsome namesake, according to a new UniSC biomechanics study of ...

One of the tools Lenz uses is Automatic Trap Company's A24 , a CO₂-powered trap that automatically resets following each strike. That allows the device to continue operating without requiring a ...

For decades, a handful of small, rounded teeth carried more evolutionary weight than the rest of the animal ever could. A ...

Researchers reconstructed antimicrobial peptides from mammal ancestors dating back about 160 million years and found that some ancient versions could strongly inhibit or kill disease-causing ...

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The bearded capuchins of northeastern Brazil typically eat plant-based foods, but they turn to small vertebrates when those ...