Yesterday was the first episode of Planet Earth II, hosted by universally beloved nonagenarian David Attenborough. The six-episode series was filmed in 40 countries over three years, and whatever it cost, it was worth every damn penny.
Sloths are one of the goofiest animals in the animal kingdom. Their passive faces and leisurely lifestyles make them ripe for jokes, but there has to be a biological explanation as to why sloths are so slow. It comes down to what they eat.