- BBC Nature: Black Rat (Rattus rattus)
- Fact file details additional names, appearance, locations, habitat, diet, social behavior, reproduction, status, and interaction with humans.
- BBC Nature: Brown Rat (Rattus norvegicus)
- Factsheet gives additional names, lifespan, overview, appearance, locations, habitat, diet, behavior, reproduction, and conservation status.
- Black Rat (Rattus rattus alexandrinus)
- Mammals of Kansas provides description, size, range and habitat, reproduction, habits, food, and additional remarks.
- Black Rat (Rattus rattus)
- Covers distribution, classification, names, range, habitat, status, facts, and zoo populations. From WAZA's Virtual Zoo.
- Black, or Roof Rat - Rattus rattus
- Information details classification, name, habitat, description, behavior, and reproduction. From America Zoo fact sheet.
- Brown Rat (Rattus norvegicus)
- Details from Nature.ca show description, characteristics, behavior, predation, diet, and offspring information.
- Brown Rat, Norway Rat - Rattus norvegicus
- Information about classification, name, habitat, description, behavior, and reproduction from America Zoo.
- Norway Rat (Rattus norvegicus norvegicus)
- Species page from Mammals of Kansas includes description, size, range and habitat, reproduction, habits, food, and additional remarks.
- Polynesian Rat (Rattus exulans)
- Wildfacts page from BBC Nature examines other names, statistics, description, range, habitat, diet, behavior, reproduction, and status.
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