* Eastern Gray Squirrel (Sciurus carolinensis): These are the most abundant and recognizable squirrels in the city, with their gray fur, bushy tails, and distinctive black ear tufts.
* Fox Squirrel (Sciurus niger): While less common than gray squirrels, fox squirrels can be found in some areas of Chicago. They are larger and have a reddish-brown to black coat with a white belly.
* Red Squirrel (Tamiasciurus hudsonicus): Red squirrels are not as common in Chicago as the other two species, but they can be spotted occasionally in parks and wooded areas. They have a bright red-brown coat and are known for their aggressive territorial behavior.
While these are the most common, other squirrel species, like the Southern Flying Squirrel (Glaucomys volans), might be present in less populated areas around Chicago.
It's important to note that squirrels are adaptable and can be found in various urban environments. Their presence in Chicago neighborhoods is a testament to their ability to thrive in human-modified landscapes.