2023 Fox Squirrel Data Showcase 

A "pest" is an unwanted animal in the same way that a "weed" is an unwanted plant. Some people consider any rodent in human spaces to be a pest, whether they are native or introduced. Many introduced species, like fox squirrels, house mice, and brown rats, thrive in human spaces; moreso than many native species. So, you could say that these species have evolved to cohabitate with humans, but they are only considered a pest if people don't want them around. Many people love the fox squirrels and would not consider them pests, but it remains that they have adapted to live in urban environments around people.