Ancient sloths lived in trees, on mountains, in deserts, boreal forests and open savannahs. These differences in habitat are primarily what drove the wide difference in size between sloth species. But ...

In the tree, going clockwise from left: extinct West Indian sloth (Acratocnus), extant three-toed sloth or ai (Bradypus), and extant two-toed sloth or unau (Choloepus). From left to right on the ...

Massive Megatherium sloths once stood as large as Asian elephants, ripping foliage off treetops with prehensile tongues like today's giraffes. "They looked like grizzly bears but five times larger," ...

New studies rearrange the sloth family tree, which includes the two existing sloths (center and right in the tree) as well as extinct giant ground sloths (bottom). Disclaimer: AAAS and EurekAlert! are ...

Look closely up in the trees of a shade-grown cacao plantation in eastern Costa Rica, and you’ll see an array of small furry faces peering back at you. Those are three-toed sloths that make their ...

A cooling, drying climate turned sloths into giants – before humans potentially drove the huge animals to extinction. Today’s sloths are small, famously sluggish herbivores that move through the ...

BEFORE WE GO, THE RACINE ZOO HAS WELCOMED A NEW MEMBER TO ITS FAMILY. TAKE A LOOK AT MISSY, A TWO TOED SLOTH. SHE’S 28 YEARS OLD. THE ZOO IS OPEN YEAR ROUND. ITS HOURS DURING THE WINTER ARE 10 TO 4.