They live in the forests and limestone outcrops of Laos. With long whiskers, stubby legs and a long, furry tail, they are rodents but unlike any seen before by wildlife scientists. They are definitely not rats or squirrels, only vaguely like a guinea pig or a chinchilla. And they often show up in Laotian outdoor markets being sold for food. There, visiting scientists came upon the animals and determined that they represented a rare find: an entire new family of wildlife. The discovery was announced Wednesday by the Wildlife Conservation Society and described in a report in the journal Systematics...