Breeds that have different taste or fat content. Breeds that require special feeds or chemicals to keep down pests. In these ways, sheep change the habits and metabolisms of those humans that farm or eat them. This mutual change can be called Mutual Reflexivity. Reflexivity is the turning back of an action onto the actor.
Mutual reflexivity is the turning of actions between different actions.
The effects of mutual reflexivity mean that it is very difficult to describe an ecology or to predict the result of any action within that ecology.