The largest sloth of all time was the size of an elephant. Known to paleontologists as Eremotherium, the shaggy giant shuffled across the woodlands of the ancient Americas between 60,000 and five ...

Earth’s history is filled with animals of astonishing size, from towering land-dwelling giants to enormous creatures that ...

Early Americans primarily hunted large animals for sustenance and survival. This strategy provided abundant calories and fats ...

When the asteroid ended the age of non-avian dinosaurs, it cleared ecological space on a global scale. Small survivors adapted quickly, and over the years, their descendants grew into animals that ...

Scientists found a “giant” creature in a forest of New Caledonia, kept it in a terrarium for decades and discovered a new species. Photo from Joachim Sameit Following lumberjacks into the forest of a ...

Rivers have been the lifeblood of human civilization throughout history, and yet we know surprisingly little about what lives in many of them—including the giant creatures that prowl their depths.

The enormous deep-sea cousins of your garden’s pill bugs can go five years without food. A gene they pilfered from bacteria ...

Architeuthis dux, better known as the giant squid, is likely the inspiration for the legendary kraken. The Granger Collection, New York There are few monsters left in the world. As our species has ...