Black Rats Ruled North AmericaUntil Brown Rats Showed Up
Briefly

The brown rat takeover happened not just in Europe but also in the Americas as these pests stowed away on ships headed across the Atlantic Ocean.
Guiry and his colleagues performed molecular analyses on 311 rat bone samples from archaeological sites across eastern and southeastern North America to understand the dominance of brown rats.
Read at www.scientificamerican.com
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