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Large (in my opinion) millipede, probably in excess of 4 inches long. Dark brown/black segments with lighter reddish brown in between them.
In leaf mould and general debris on stone steps in an organic garden. Once disturbed, it travelled up the wall and disappeared into similar damp leafy debris under a lavender bush.
These are always cool to find. They are quite harmless, but will emit a very foul-smelling yellow liquid in self-defense. (and I mean FOUL! eww) This liquid can cause skin irritations and eye issues, so always always always wash your hands if it gets any on you.
Quoting wikipedia " Many other millipedes secrete hydrogen cyanide, and while there have also been claims that N. americanus releases hydrogen cyanide, this is not true. They do however, excrete a substance that causes a temporary, non-harmful discoloration of the skin.[5]"