Ko te mahi a te roera ara he whakawhiti i te taumaha o te keri ki te whenua. Ina whakahaerehia he keri i runga i te whenua koretake, ka pāngia ngā roera ara e te taumahatanga nui. Nō reira, he nui te hiahia mō ngā roera ara. Hei tāpiri, ki te kore e pai te kounga o te hua, ā, he maha ngā wā ka puehu, he mea nui kia hiritia kia kore ai e kohia te paru, te onepu me te wai, ka kino pea.
