rattus
- n common house rats; upper incisors have a beveled edge
- British health authorities have discovered that brown "house" rats (Rattus norvegicus) in Wales and black "ship" rats (Rattus rattus) on Liverpool's docks now eat warfarin as .
- The black rats (Rattus rattus rattus) of ancient history invaded the granaries of Egypt, afflicted the Hebrews with plague, and are reported to have stimulated the Romans to .