Bristly millipede, Polyxenus laguru, Polyxenidae

This tiny millipede (2-3mm) is found in Europe and North America. Its detachable bristles are used as a defense against predators.

Photo 1 by alexis_orion, 2-3 by renko, 4 by glandarius, 5-7 by reiner, 8 (with springtail) by mareks16021974, and 9 for scale by gerrit_oehm