For instance, some ecology researchers believe the gypsy moth is not entirely unbeneficial in the US: on previously cleared land, dominant oak species suppress the growth of other trees, but gypsy moth caterpillars eat oak leaves, thereby giving other trees more of a chance and helping woodland regain its diversity.
甚至有生態學者認為，歐洲舞毒蛾也並非全無是處，在美國，被開發過的土地上，強勢的橡樹壓抑了其他樹種的生長，舞毒蛾專吃橡樹葉子，等於讓其他林木有機會出頭，讓林地恢復生物歧異度。