Cov rooj hluav taws kub muaj nyob rau hauv ntau lub tsev pej xeem, tshwj xeeb tshaj yog cov neeg ua noj, thiab kuj tseem yog ib qho kev sib xyaw ntawm cov nkoj marine. Cov qhov rooj no feem ntau yog ua los ntawm cov ntoo hnyav lossis lwm yam khoom siv, overlaid nrog hlau. Tus ncej yog txoj hlua khi uas tua hluav taws kom tau kaw thaum lub qhov rooj hluav taws tau kaw, ib lub taub hau huab cua kom nruj. Cov rooj tua hluav taws muaj nyob nrog pes tsawg teev lawv tuaj yeem tiv taus hluav taws ua ntej lawv vau lossis hlawv.
