We　studied　the　torsion　behavior　of　α-Fe　nanowires　seeded　with　twin　boundaries　(TBs)　using　molecular　dynamics　simulations.　Twisting　the　wire　generates　topological　defects　in　the　twin　walls,　namely　kinks　inside　the　twin　walls　for　small　twist　angles,　and　junctions　between　kinks　for　large　twist　angles.　During　twisting　the　kink　motion　is　jerky　and　uncorrelated　at　small　twist　angles.　The　probability　density　function　(PDF)　of　jerks　strength　follows　approximately　a　Gaussian　distribution,　indicating　a　mild　deformation　mode.　The　kink　dynamics　transforms　from　mild　to　wild　at　larger　twist　angles　when　complex　twin　patterns　with　a　high　density　of　junctions　are　generated.　The　collective　motion　of　kinks　now　shows　avalanche　behavior　with　the　energy　being　power-law　distributed.　The　wildness,　which　measures　the　proportion　of　strain　energy　relaxed　through　such　avalanches,　is　correlated　with　the　junction　density,　and　controlled　by　the　external　length　scale　(wire　diameter)　as　well　as　an　internal　length　scale　(twin　boundary　spacing).　Good　strain-stress　recoverability　is　achieved　when　unloading　the　wire　before　the　formation　of　complex　twin　patterns.　We　correlate　the　evolution　of　twin　patterns　with　a　statistical　analysis　of　jerk　dynamics,　which　identifies　the　unique　mechanical　properties　governed　by　twin　boundary　motion　in　nanowires.　©　2020　Acta　Materialia　Inc.