While I've been working outside doing yardwork recently I've found several HUGE millipedes. The one in the below picture was found today, and it was almost as big as my palm. I would estimate that it was approximately 4 inches or longer if I unrolled it, which I did not, as it was squirming. I fed it to my chickens, as I do with all bugs I find. After doing some research, I determined it was a "narceus americanus".
A narceus americanus is a large North American millipede. It inhabits the eastern seaboard of the United States through southeastern Canada and west to central Texas. It is one of the largest North American millipede species, reaching a length of four inches. When threatened, they sometimes curl up or release a noxious liquid that contains large amounts of benzoquinones which can cause dermatological burns. This fluid may irritate eyes or skin.
Maybe I shouldn't feed these to my chickens...