Tiger claw passion vines that spiral up one hundred year old trees. They have claws grasping out of nodes along their length that grips the bark. They take the trees down. Waiwi, the sweet tasting strawberry guava, poisons the soil so only their kind can proliferate. Its bark peels off like paper and sheds often so the native mosses can't grow on it and share the rain.
Wild pigs make mud pools that make erosion and attract malaria bearing flies that make birds dead.
White tailed axle deer trample the undergrowth with razor sharp hooves. The invaders came off missionary boats to a colony of weakened rarities. They ran up through the rows of cane like reversed sunshine and exstinguished. Evolution made the rarities on the preserve. Seeds and insects, nestled in the feathers of sea faring birds, the first discoverers of these islands, held tight in the soil.