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| | Black Death - Wikipedia, the free encyclopedia |
 | | The fl rat (Rattus rattus) was originally introduced from Asia to Europe by trade, but was subsequently displaced and succeeded throughout Europe by the bigger Norwegian or brown rat (Rattus norvegicus). |
 | | Combining information on the biology of Rattus rattus, Rattus norvegicus, and the common fleas Xenopsylla cheopis and Pulex irritans with modern studies of plague epidemiology, particularly in India, where the R. |
 | | rattus is a native species and conditions are nearly ideal for plague to be spread, Twigg concludes that it would have been nearly impossible for Y. |
| en.wikipedia.org /wiki/Black_Death (6750 words) |
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