What is a feature of territorial defense polygyny?

In territorial defense polygyny, the relationship between males and females is defined by the males defending a specific territory that is attractive to females. Females typically choose mates based on the quality of the territory, which is often a reflection of the resources available within that area. This means that a female will select a male based on his ability to successfully defend a territory that meets her needs for nest sites, food, or other resources essential for successful reproduction.

While males do establish territories that are often a result of competition among themselves, the defining feature of this mating system is that females are the active selectors when it comes to choosing which male to mate with, primarily based on the territory he defends. Therefore, the correct answer highlights the critical role of female choice in relation to the territories defended by males in this context.