Replicator

A replicator (or paper) makes repeated copies of itself and executes them in parallel, eventually filling the entire core with copies of its code. Replicators are hard to kill, but often have difficulty killing their opponents. Replicators therefore tend to score a lot of ties, particularly against other replicators. The earliest example of a replicator is Mice by Chip Wendell. From http://www.wikipedia.org the free encyclopedia that anyone can edit.