Interesting to read the Red as a pest. Assuming we are talking about the same Red.
It (the species I am familiar with) is smaller than the Grey by some margin.
Here are the varieties I am talking about (photo courtesy of Morelle, 2008)
:
Indeed in the UK, the native Red has all but been wiped out by the NA Grey that came over with the merchant ships. There are a few enclaves of Red still in Great Britain, but very few and only because of active conservation efforts, providing "Red-sized" feeders etc....
Elsewhere the Greys have killed off or out-competed Reds for food and territory.
Definitely a case of Grey Devil on this side of the Pond.
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