Some 27,000 years ago in central Belize, a giant sloth was thirsty. The region was arid, not like today’s steamy jungle. The Last Glacial Maximum had locked up much of Earth’s moisture in polar ice caps and glaciers. Water tables in the area were low. The sloth, a beast that stood up to 4 meters tall, eventually found water – in a deep sinkhole with steep walls down to the water. That is where it took its final drink.