Sciurus carolinensis or grey squirrel. I really love these guys, they are native to eastern North America, where they are the most prodigious and ecologically essential natural forest regenerator. Without any doubt these should be the official city pet, there's tons of them in Montreal, you can see a lot of people feeding them... Even if there are signs everywhere saying that you shouldn't.
People may think that they are helping them, but in fact it's all the opposite, by changing their feedings behavior and making them dependent of humans.