Squirrels were intentionally introduced into American cities ~150 years ago: https://www.bloomberg.com/news/articles/2013-12-20/the-forgotten-history-of-how-ci

Squirrels were intentionally introduced into American cities ~150 years ago: https://www.bloomberg.com/news/articles/2013-12-20/the-forgotten-history-of-how-cities-almost-killed-the-common-squirrel https://www.bloomberg.com/news/articles/2013-12-20/the-forgo... https://www.phillymag.com/news/2013/12/12/philly-first-city-america-squirrels/ https://www.phillymag.com/news/2013/12/12/philly-first-city-...