Which is the largest and most common domestic rat?

• A. Roof.
• B. House.
• C. Norway.
• D. Scandinavian.

Answer: (C)

The largest and most commonly encountered rat around homes is the Norway rat (Rattus norvegicus). It’s bigger and stockier than the roof rat, which is why it’s often considered the dominant domestic rat. Norway rats typically weigh more and have a robust body, making them the species you’re most likely to encounter in basements, sewers, garbage areas, and other human-made environments. The term “house rat” is sometimes used for the same brown rat, contributing to the idea of its prominence in domestic settings. In short, its larger size and greater adaptability to human habitats explain why it’s the most common domesticated rat.