褐大頭蟻原本棲息於非洲南部,但已成東非的入侵物種。牠們消滅了原本棲息在相思樹上的原生螞蟻群落,而相思樹原本受螞蟻保護,讓樹免受斑馬、大象等草食動物的食用。 原生螞蟻的消失導致相思樹相繼減少,影響生態平衡。 獅子是以伏擊捕獵,牠們會用樹作為掩護,伏擊斑馬等獵物; 沒有了相思樹令牠們的成功率亦下降,影響了牠們的捕獵策略。
Big-headed ant was originally from southern Africa, but has became invasive species in East Africa. They wipe out the colonies of native ants on the acacia trees, which are defended by the native ants from herbivores like zebras and elephants. Without the native ants, acacia trees are gone, affecting the ecosystem. Lions are ambush hunters and would use the trees as cover to stalk their prey like zebras; without the trees, their success rate decreases and they have to change their strategy and diet.