Sloths are certainly slow (at absolute top whack they can travel at around 6 cm per second), but lazy they are not. Several years ago, I interviewed Rory Wilson, a biologist at Swansea University, in Wales, UK and the inventor of “the daily diary”, a nifty electronic gadget that records the movement of animals in incredible detail. At that time, the gizmo had mainly been used to study fast-moving creatures such as penguins and cormorants.