Sloths may seem like quirky tree-dwellers today, but their past reveals a dynasty of giants that once roamed the Americas.

Scientists studied chimpanzees in Uganda's Budongo Forest and noticed that they were eating something unexpected for ...

Visits to the world’s tallest tree in Redwood National Park in California are now off-limits after hikers damaged the forest and left a mess, rangers reported. There’s no trail to Hyperion, dubbed the ...

A new study shows how African elephant poop helps make American-made guitars -- and how poaching of elephants is contributing to a decrease in ebony trees.