The ending can be interpreted in two different ways:
1. Literal Interpretation: In this interpretation, the ending is set within a simulation or virtual reality. Davidson realizes that the world he has been inhabiting is not real and that he has been part of an experiment conducted by the apes. The final lines of the film, where he asks if the apes are still out there, refer to his skepticism about whether he has truly escaped the simulated reality.
2. Metaphorical Interpretation: This interpretation views the ending as a metaphorical representation of Davidson's emotional and psychological journey. Throughout the film, he struggles with his own humanity and the violent nature of his species. The "apes" in this interpretation symbolize his inner demons or the dark aspects of human nature. By facing and confronting these aspects, Davidson comes to a deeper understanding of himself and humanity, leading him to question his place in the world and his relationship with the apes.