Your Workout Burns Fewer Calories Than You Think

Our bodies compensate for at least a quarter of the calories we expend during exercise, undermining our best efforts to lose weight by working out.

Female Hummingbirds Avoid Harassment by Looking Like Males

Among white-necked Jacobin hummingbirds, those with plumage that resembles colors found on males get harassed less.

‘Totally Surprising and Rather Horrifying’: Giant Tortoises Eat Baby Birds

For the first time, scientists in the Seychelles captured footage of one of the hulking reptiles stalking and killing a helpless chick.

This Rattlesnake Dares You to Call Its Bluff

Scientists designed a virtual reality experiment to understand just how tricky rattlesnakes can be.

What If You Could Become Invisible to Mosquitoes?

Using Crispr, scientists have taken the first step toward creating a mosquito that is blind to human hosts.

What Animals See in the Stars, and What They Stand to Lose

Humans aren’t the only species that navigate by starlight. Animals from birds to dung beetles may do it, too — and might become disoriented as our city lights drown out the heavens.

Over 200 Million Years Ago, Nature Called. It Was Full of Beetles.

Fossilized feces from a dinosaur ancestor preserved an insect species not previously known to science in exquisite detail.

Tiny Fossils From Alaska Reveal Dinosaur Life in the Arctic

Baby dinosaur “microfossils” suggest that many species lived and thrived in some of the coldest parts of the planet.

This Tiny Creature Survived 24,000 Years Frozen in Siberian Permafrost

The microscopic animals were frozen when woolly mammoths still roamed the planet, but were restored as though no time had passed.

On the Verge of Extinction, These Whales Are Also Shrinking

The few living North Atlantic right whales are smaller than previous generations, and some show signs of severely stunted development.