 Darwin thought his theory could explain a lack of evolution, and Darwinists in Darwin’s wake have explained not only stable polymorphisms, but unstable ones, cyclical behaviors, protected polymorphisms, and a variety of other behaviors that differ from simple directional evolution. These sorts of behaviors result from specific assignments of values for theoretical parameters in many of the very same models that are used to explain simple directional selection (where a single variant spreads throughout a population, as in the wolf case discussed in the introduction). The point is that systems seemingly governed by evolutionary theory exhibit a variety of different sorts of dynamics, and this variety includes both different sorts of evolution, including at least cyclical and directional, as well as a lack of evolution at all, as in cases of stabilizing selection.