For more brilliant natural history shows, exclusive to YouTube, head over to our brand-new channel Earth Unplugged! www.youtube.com/earthunplugged In this amusing and entertaining clip from the BBC's Life of Mammals, David Attenborough looks at the life of a sloth. The sloth has adapted to the lack of nutrition in its diet of leaves by hanging around not doing very much at all. We even get to see one moving at high speed! Watch more high quality videos on the BBC Earth YouTube channel here: www.youtube.com/BBCEarth and visit www.BBCEarth.com for all the latest natural history exclusives and fantastic new wildlife videos.