well, _something_ has to be there, right? there's a lot of energy floating down there in the urban substrata, from sewage and trash going upward, so a food cha

well, _something_ has to be there, right? there's a lot of energy floating down there in the urban substrata, from sewage and trash going upward, so a food chain naturally emerges as opportunistic omnivores break the ground with predators following suite.