Symbiotic Relationships in the Tropical Rainforest. Mutualism: Leaf cutter ants and fungus are an example of this relationship. The ants protect the fungi from pests and mold and also feed it with small pieces of leaves.The ants keep their larvae in the fungi which protects it and feeds it.Parasitism:eaf cutter ants and fungus are an example of this relationship. The ants protect the fungi from pests and mold and also feed it with small pieces of leaves. The ants keep their larvae in the fungi which protects it and feeds it. Parasitism: