Ancient sloths ranged in size from tiny climbers to ground-dwelling giants. Now, researchers report this body size diversity was largely shaped by sloths’ habitats, and that these animals’ precipitous ...

What did early humans like to eat? The answer, according to a team of archaeologists in Argentina, is extinct megafauna, such as giant sloths and giant armadillos. In a study published in the journal ...

Giant sloths with razor-sharp claws and as large as Asian bull elephants once roamed the Earth, snacking on leaves at the tops of trees with a prehensile tongue. Now, scientists have figured out why ...

Each year 500,000 people visit New Mexico's White Sands National Monument to hike and frolic among gypsum dunes. Aside from the tourists, few animals in the region get much larger than a coyote or ...

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The northern and southern maned sloths may look very similar from the outside, but their genomes reveal different stories: The two species have faced very distinct conditions in Brazil's Atlantic ...