The diseases caused by Rats
--Plague (also named Black Dead Disease)
--Pnenmonic Plague, Bubonic Plague
--Hantaan Fever
--Typhus
--Rat-Bite Fever
--Boutonneuse Fever
--Lassa Fever
Rat's characteristics
- to hide by day and come out at night
- to be good at climb, especially rattus rattus
- to be skilled in swimming
- the sphere of activities of Rattus norvegics and Rattus rattus always are 30-50 meter, and mus musculus is 5-10 meters
- rat is a polyhonic animal

There are 3 main species of rats and mice that are of significance in the United States.  They are the Roof Rat or tree Rat, the Norway Rat or ground rat, and the House Mouse.  Of course there are lots of other species of commensally rodents that homeowners and building owners deal with 90% of the time.
The Roof Rat has  long tail, large ears and has a slender body.  Roof Rats are commonly found in trees, attics, old houses, and is the #1 rodent found in inner cities.
Norway Rats have small ears, short tail, and have a fat rounded body.  Norway Rats are commonly found in fields, sewers, living under debris, etc.  There are the # 1 rat infesting barns, poultry houses, and rural areas.
The House Mouse generally lives inside or near homes.  They are the # 1 mouse infesting inner city homes and buildings.
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