Hniav barbed hlau, tseem hu ua rab chais barbed hlau, yog ib yam tshiab ntawm kev tiv thaiv cov khoom tsim nyob rau hauv xyoo tas los no nrog muaj zog tiv thaiv thiab kev sib cais muaj peev xwm. Thaum pib, cov hniav barbed hlau feem ntau yog siv hauv tsev loj cuj rau kev tiv thaiv. Vim hais tias cov hniav yog ntse thiab tsis yooj yim rau kov, nws plays ib tug deterrent nyhuv.
Tab sis tam sim no kev siv rab chais barbed hlau yog qhov dav dua, nws tuaj yeem siv rau kev tiv thaiv phab ntsa ntawm cov neeg nyob hauv, thiab tseem tuaj yeem siv rau hauv cov ntaub thaiv npog, thiab lwm yam. Cov nyhuv tiv thaiv tub sab ntawm cov hlau barbed zoo dua li cov hlau barbed zoo tib yam, thiab tus nqi tsis siab, yog li cov chais barbed hlau yog nrov heev. Qhov ntau siv dav.
Cov ntse riam-puab pos yog buckled los ntawm ob lub xov hlau thiab tsim rau hauv ib lub concertina zoo, uas yog ob qho tib si zoo nkauj thiab txias. Ua si muaj kev cuam tshuam zoo heev. Nyob rau tib lub sijhawm, cov khoom lag luam muaj qhov zoo ntawm cov tsos zoo nkauj, zoo tiv thaiv cov nyhuv thiab kev tsim kho yooj yim.