A moving habitat

About once a week the three-toed sloth of Central and South America (Bradypus variegatus) descends from the trees, where it lives among the branches. For this slow-moving mammal, the journey is a dangerous and laborious undertaking, but it is one of great importance to members of the community among and aboard the sloth. Once the sloth has reached the ground, often some 30 metres (100 feet) beneath its usual perch, it digs a pit at...