LA FORTUNA, Costa Rica -- A child zooming down a zipline through a rainforest in Costa Rica collided with a slow-moving sloth clinging to the cable. It happened Sunday at the Go Adventure Arenal Park ...

At first glance, sloths look like an evolutionary mistake. They move slowly, eat almost nothing, and seem defenseless in one of the most dangerous ecosystems on Earth. But every part of their biology ...

The Tulsa Zoo is home to thousands of animals, but some of the most popular residents may be harder to spot during a visit. Sloths spend much of their day hanging in trees, conserving energy and ...

This video reveals why sloths move so slowly that algae is able to grow directly on their fur. Viewers learn how this surprising relationship helps camouflage the animals and support tiny organisms ...