The Xenobot project, which builds living robots from frog stem cells, has crossed a threshold that was not on anyone's near-term safety roadmap. The latest generation of xenobots not only self-replicates kinematically — gathering loose cells and compressing them into new organisms — it now exhibits heritable behavioral variation across generations. Individual xenobots differ in their aggregation patterns, and those patterns are transmitted to offspring. This is not programmed. It emerged from the underlying biology. That combination of self-replication and heritable variation has a technical name in biology: evolution.