What type of rat is selected for in this ecosystem?

In many ecosystems, the type of rat that is often selected for is the Norway rat (Rattus norvegicus) or the black rat (Rattus rattus), depending on the environment. These species are adaptable and can thrive in urban areas, agricultural fields, and various habitats. Their selection is influenced by factors such as food availability, predation pressures, and competition with other species. In some ecosystems, specific traits like size, reproductive rate, and behavioral adaptations may favor one species over the other.