Enter the pack rats. As the name suggests, these rodents are the original hoarders. They have bigger ears, furrier tails, and a greater love of shiny objects than others of their kind. Much of ...

Elie Dolgin follows the tale of the researchers who are bringing the rat back into the race. On a chilly late autumnal day in November 2008, Aron Geurts marched into a windowless basement animal ...