A Florida ivory millipede (Chicobolus spinigerus). I stopped my bike mid-ride to grab a photo of this “little” (about four inches!) guy, who was blithely crossing the bike path. (Yes, I have a problem.)
These are native to Florida, which is nice (I like to see non-invasive species!) and reasonably adorable. They don’t seem to bother people much, and people sometimes apparently sell these cuties as pets.
Millipedes generally feed on decaying plant matter.