These are great online resources for more information about rats:

• Victor Professional Rat Traps 
  The most sensitive and durable rat traps.



• Rat Genome Database 
  (http://rgd.mcw.edu)



• Benefits Provided by Roof Rats
  (http://www.roofrats.org)
  
  
• Rats as Pets 
  (http://exoticpets.about.com/cs/careofrats/a/ratsaspets.htm)



• Rats Reproduction 
  (http://www.ratfanclub.org/repro.html)