This one-act play concerns two characters, Peter and Jerry, who meet on a park bench in New York City's Central Park. Peter is a middle-class publishing executive with a wife, two daughters, two cats and two parakeets. Jerry is an isolated and disheartened man, desperate to have a meaningful conversation with another human being. He intrudes on Peter’s peaceful state by interrogating him and forcing him to listen to stories about his life, and the reason behind his visit to the zoo. The action is linear, unfolding in front of the audience in “real time”. The elements of ironic humor and unrelenting dramatic suspense are brought to a climax when Jerry brings his victim down to his own savage level.
Eventually, Peter has had enough of his strange companion and tries to leave. Jerry begins pushing Peter off the bench and challenges him to fight for his territory. Unexpectedly, Jerry pulls a knife on Peter, and then drops it as initiative for Peter to grab. When Peter holds the knife defensively, Jerry charges him and impales himself on the knife. Bleeding on the park bench, Jerry finishes his zoo story by bringing it into the immediate present: "Could I have planned all this. No... no, I couldn't have. But I think I did." Horrified, Peter runs away from Jerry, whose dying words, "Oh...my...God", are a combination of scornful mimicry and supplication.