And then came the three-toed sloth. Stupid sloth. It was a crazy-looking beastie, all arms and bristling grey fur; its body was a blob, the kind of shape a six-year-old would draw for a pig, and its face was flattened like a racoon that had run full tilt into a brick wall. A triangular stub of a nose jutted out at an angle beneath a fringe that must have been difficult to see through. In fact, from side-on it looked disturbingly like John Lennon.