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 ...

The encounter, witnessed by safari tourists in an open jeep, was captured on camera.

Watch habitat camera of adorable newborn sloth bears Two baby sloth bear cubs were born at Smithsonian’s National Zoo, making it the first birth of the species at the zoo since 2013.

For years scientists assumed that sloths don't fart — believing the methane produced by their slow digestive system was simply absorbed into their bloodstreams and breathed out through their mouths.