Recently in Banff and Jasper while my comment isn't about rats I found Banff's whole Jurrasic Park wilderness to be fascinating. Meaning there must be 30 to 60 miles of fencing blocking wildlife from entering the highway. To enter into the wilderness there you can park your car in state park parking lot, then step up a few stairs, open the locked gate and then go down a few stairs into the wilderness. For me (from Pennsylvania/Maryland) it had a definite Jurassic Park vibe.