A variety of studies are showing that rough-and-tumble play is important for animals and kids alike.

From giant stick bugs to rarely seen sea creatures, these animal videos fascinated us—and led to new scientific discoveries.

A natural experiment in a national park in Patagonia shows how the return of a large predator can reshape an ecosystem.

From an elusive jaguar to an industrious beaver, photographers captured iconic animal moments around the world.

In 1989, paleontologist Darren Tanke suggested that similar breaks were the result of mating as one dinosaur mounted the ...

They’re like living feather dusters whose mouths can see you coming. The simplest animal eyes consist of light-sensitive ...

As habitat loss and invasive predators decimate the Texas horned lizard population, researchers are banking on statewide ...

Egyptian geese are aggressively territorial. During mating, they are monogamous, making it likely the pair fighting the ...

They say every generation thinks it's the end of the world. But the Santa Cruz long-toed salamander has been staring at oblivion since 1967 That’s the year the amphibian was listed under the ...

While the world-famous Inca Trail is undoutedly Peru’s headline hike, the Quarry Trail is a less-crowded alternative that’s ...

For deep reef divers, descending into the ocean’s mesophotic layer can feel like exploring the moon. Discovering never-before ...

This story originally published in the July 1906 issue of National Geographic magazine. See more digitized stories from our archives here. Looking back to that period, many years ago, when the finger ...