Let that Ludwig find his lemming and be happy and leave me in peace. Slothrop finds him one morning by the shore of some blue anonymous lake, a surprisingly fat kid of eight or nine, gazing into the water, crying, shuddering all over in rippling fat-waves. His lemming's name is Ursula, and she has run away from home. Ludwig's been chasing her all the way north from Pritzwalk. Something just came over her.
Lemmings never do anything alone.
They need a crowd. It gets contagious. Ludwig, they overbreed, it goes in cycles, when there are too many of them they panic and run off looking for food. I learned that in college, so I know what I'm talking about. Maybe that Ursula's just after a boy friend or something.