She and her mate have become even larger thorns in my side.
Hooks, thorns and prickles are characteristic of many South African plants.
Aridity has favoured the production of spines as a defence from external attack, sharp thorns are frequent, and asperities of various sorts predominate.
In tropical countries ants sometimes make their nests in the hollow thorns of trees or on leaves; species with this habit are believed to make a return to the tree for the shelter that it affords by protecting it from the ravages of other insects, including their own leaf-cutting relations.
Of the thorns, the guda and the wadi often grow from 30 to 50 ft.