Living Thing
Organic machines whose sole purpose is to make more machines that in turn make more of these same machines.
Think of it in terms of a factory that makes more factories exactly like the original. Then these newly created factories make more factories just like the original and so on.
Think of it in terms of a factory that makes more factories exactly like the original. Then these newly created factories make more factories just like the original and so on.
That rat is a living thing. All it does is make more rats which in turn make more rats.