How to hunt a giant sloth—according to ancient human footprints

Rearing on its hind legs, the giant ground sloth would have been a formidable prey for anyone, let alone humans without modern weapons. Tightly muscled, angry and swinging its fore legs tipped with wolverine-like claws, it ...

Sloths are no slouches when it comes to evolution

Today's sloths might be known as slow, small animals, but their ancestors developed large body sizes at an amazing rate, according to an evolutionary reconstruction published today in the open access journal BMC Evolutionary ...

Ancient species of giant sloth discovered in Mexico

Mexican scientists said Wednesday they have discovered the fossilized remains of a previously unknown species of giant sloth that lived 10,000 years ago and died at the bottom of a sinkhole.

'Hypercarnivores' kept massive ancient herbivores in check

When the largest modern-day plant-eaters—elephants—are confined to too small an area, they devastate the vegetation. So 15,000 years ago, when the herbivores like the Columbian mammoth, mastodons and giant ground sloths ...

New research shakes up the sloth family tree

New studies by two research teams published today in the journals Nature Ecology and Evolution and Current Biology challenge decades of accepted scientific opinion concerning the evolutionary relationships of tree sloths ...

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