TIL the North American Gray Squirrel is considered an invasive species in Britain as the squirrels carry a squirrel pox that is deadly for the Red Squirrels native to Britain. The Gray Squirrel also eats seven times as much food as the Red Squirrels, crowding out any who survive the squirrel pox.

Read more: http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Sciurus_carolinensis.htm#:~:text=The%20Grey%20Squirrel%20has%20made,Norway%20rat%20(Rattus%20norvegicus).

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