Carl the Collector Episode 3 Lemons!/The Butterfly Collection >Carl prepares a bottle to keep his three black swallowtail butterflies after they complete their metamorphoses. He learns from a book that butterflies need nectar, which he cannot gather, and is angered when Sheldon expresses concern about the butterflies experiencing asphyxiation in the bottle. Maude asks Carl to consider how he would feel if he was trapped in a jar and to consider his choices regarding the butterflies. When the butterflies emerge from their chrysalis, Carl decides to hold a farewell party and set the butterflies free.