I live in central Pennsylvania where I frequenly find both black racers and black rats. A friend of a friend who lives in the country near a few farms/fields was having a snake infestation problem. (not really a problem if you ask me!! haha) They reportedly have atleast 5-6 different snakes crawling out from around the foundation of their house. They claim the snakes are VERY aggressive and will actually charge you. They took a few pictures from a window above. I spent a few days searching their property and found zero snakes. I have caught more black rats and racers than i can probably count. My personal opinion based on the photos i was given is that the snakes are black racers. My brother feels very convinced they are black rats. Can i get some input from some of the other experts? Your input is greatly appreciated!