Rodent Rat Varieties

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Advanced Pest Northwest - NW Pests

Common Rodent and Rat Varieties

 Common Rodent Varieties: 


Norway Rat


Norway Rat (Rattus Norvegicus, Warf rat, Brown Rat): Medium sized, chunky, small/sturdy ears, tail shorter than the body/pink/scaly, Blunt/broad muzzle, good swimmer, prefers ground dwelling, basements, sewers, crawlspaces, under slabs.



 Roof Rat (Rattus Rattus, Black Rat, Ship Rat): Medium sized, slender, large/creased ears, tail longer than the body/gray, narrow muzzle, agile climber, doesn’t like swimming, prefers attics, rafters, forms runways along pipes, wires, beams.


House Mouse (Mus Musculus): small 3-4 inches, 3-4” tail, large ears, long/thin tail as long or longer than body, small triangular head, narrow/sharp muzzle, small feet.


Deer Mice: (Peromyscus)


Hanta Virus: Carried primarily through deer mice


For more information on the Hanta Virus visit:



Helpful Rodent Prevention Tips:


Exclusion of Rodent entry points:

  1. Fill entry points larger than ¼” or larger, or pencil width under a door.
  2. Repair crawlspace access doors and/or covers to make tight fitting
  3. Repair crawlspace vent screens that are not secure or have holes
  4. Repair gaps in trim, siding, skirting
  5. Repair gaps under doors and damaged door seals
  6. Fill holes for plumbing, gas lines and wiring
  7. Screen sewer, drain pipes
  8. Trim back foliage near building or roof


Sanitation Management:

  1. Keep garbage picked up and stored in tightly sealed containers. Rodents can gnaw through plastic so metal or thick/hard plastics are preferred.
  2. Keep stored foods, pet food and lawn/bird seed in plastic or metal containers with tight lids.
  3. Clean up dirty dishes and spilled foods right away.
  4. Clean BBQ grills and keep area clean.
  5. Remove pet bowls immediately after use. Clean up any spilled food and bring in water dishes over night.
  6. Remove bird feeders: they attract rodents as well as the scattered seeds that drop on the ground.
  7. Keep compost far away from the house.
  8. Remove overripe produce from under fruit trees and gardens.
  9. Clean up pet feces and seal pet doors at night.


Environmental Management:

  1. Trim foliage back away from buildings, trim thick foliage near buildings
  2. Keep lawns mowed
  3. Eliminate stored items near buildings. Rodents will burrow under anything left on the ground.
  4. Routine rodent maintenance to keep rodent populations managed.
  5. Consider crawlspace cleanouts for bad infestations.  




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