Thoreau went to Walden Pond to live simply in the wild and contemplate his own place in the world by observing nature. Robert Sullivan went to a disused, garbage-filled alley in lower Manhattan to contemplate the city and its lesser-known inhabitants -- by observing the rat. Rats live in the world precisely where humans do; they survive on the effluvia of human society; they eat our garbage. While dispensing gruesomely fascinating rat facts and strangely entertaining rat stories -- everyone has one, it turns out -- Sullivan gets to know not just the beast but its friends and foes: the…
