This week, we're exploring the ways human-made environments support - and shape - the lives of many species we think of as vermin. We'll talk to Geography and Environmental Studies Professor Dawn Day Biehler about her book "Pests in the City: Flies, Bedbugs, Cockroaches, and Rats." And we'll speak to postdoctoral researcher Clint Penick about his research on the junk food diets of urban ants.