Perhaps no creature has so fired the imagination of a populace as the armadillo-that most ungainly, awkward, and timid little animal. Its detractors call it a varmint and wish it good speed from the Lone Star State and its other natural territories. But its supporters claim that it is the animal kingdom's representative of all that's truly Texan: tough, pioneering, adaptable, and generous in sharing its habitation with others. What is it that sets...