Everyone knows the tiger, the panda, the blue whale, but what about the other five to thirty million species estimated to inhabit our Earth? Many of these marvelous, stunning, and rare species have ...

There are degrees of slothfulness, it turns out, even when it comes to sloths. And three-toed sloths may be the most slothful of them all: A species of the animal has a field metabolic rate that is ...

A newly discovered skeleton from an ancient three-toed horse not only provides information about ancient Tibetan wildlife, but it also sheds light on the habitat and elevation of Tibet nearly 5 ...

The charismatic and slow three-toed sloth is just one of many animals species that Smithsonian scientists study, from within our vast collections to live animals at our research centers and National ...

A new analysis of three-toed sloths’ survival in the forests of Costa Rica offers two-fold insights for scientists hoping to aid the tree-dwelling critters. As Veronique Greenwood explains for The New ...

Local species of woodpeckers are common and widespread, like the downy and hairy, and also the northern flicker and the Williamson’s and red-naped sapsuckers. These species are reliable in their ...

Three-toed dinosaur footprints discovered by rock climbers in China were made 190 million years ago by a 17-foot cousin of T. rex, a study found. The prints — of which there are 46 — were found in ...