| Rattus | The rats, a genus of rodents, family Muridae. Rattus rattus, the black r., is the species most commonly responsible for transmitting plague to man by means of its flea, Xenopsylla cheopis; it is smaller and darker in colour than the Norwegian, sewer, or brown rat (Rattus norvegicus) and has longer ears and tail. See: rat. (05 Mar 2000) |
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| Rattus norvegicus | common domestic rat |
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