"When Day is Done" by Arnold Castle is a science fiction short story published in the early 1960s. The narrative is set in a future society where individuals participate in recreational jungle runs filled with robotic animals, simulating a hunting experience. The story explores themes of adventure, human resilience, and the complexities of social interactions within a highly controlled urban environment. The protagonist, Bertram J. Bernard, is president of a company and an experienced jungle runner. He begins his run after work and encounters dangers within the jungle, particularly from robotic panthers. During his adventure, he comes to the aid of a young woman who is about to be attacked by these mechanical beasts. After saving her, they share a brief moment of connection before Bernard declines her invitation to join her for a drink. Throughout the story, Bernard reflects on his long history as a jungle runner and his contentment with his life as he returns home to his wife, embodying the blend of thrill and mundanity in this unique futuristic setting. (This is an automatically generated summary.)