This document provides information on the roof rat (Rattus rattus), including: 1) A description of its physical appearance and the three color phases seen in Florida. 2) Details on its habits of living in close association with humans and frequenting attics and buildings. 3) Information about its breeding cycle of reaching sexual maturity at 3-4 months and giving birth to litters of 5-8 pups every 21-23 days, with 4-5 litters per year. 4) Diseases it can transmit including hantavirus, murine typhus, rat-bite fever, salmonella, and leptospirosis.