North American porcupines like this are, as their name implies, all over North America. They're mainly nocturnal, but being active during the day isn't unknown. This guy's been hanging around our backyard in Chester for a few weeks now, and is out and about during the day quite a bit. He likes to eat the bark off that pine tree, and also sometimes will pull something out of our compost bin.

I saw one under a shed in Barrington, out in the woods on one of those private roads.