What type of environment does the Norway rat prefer for nesting?

The Norway rat primarily prefers nesting in underground burrows. These burrows provide them protection from predators, harsh weather conditions, and help in maintaining a stable environment for their breeding. This species tends to construct extensive burrow systems in areas where they have access to food and water sources, such as near human dwellings, garbage sites, or agricultural areas. The underground setting allows them to stay hidden and safe, which is crucial for their survival.

The other choices do not align with the Norway rat's nesting preferences. For example, while high trees may provide some shelter, they are not a typical nesting site for this species, as Norway rats are more terrestrial. Open fields offer less security and are not as suitable for their burrowing habits. Impermanent urban structures might attract rats for food and shelter, but they do not replicate the secure nesting conditions that burrows provide. Therefore, the preference for underground burrows is a key characteristic of the Norway rat's behavior and ecology.