Generalists are species that can thrive in many different kinds of environments and can feed on a varied diet. On the other hand, specialists require specific or special kinds of environments and diets for them to live, reproduce, and thrive. Because of their nature, specialists tend to less likely be able to adapt to changes in their environment. Inability to adapt would eventually lead to their deaths or their inability to reproduce, reducing the population of their species. Thus, endangered species are more frequently specialists.