Symbiotic relationships are everywhere in nature. Fungi enhance water and nutrient absorption for plants by feeding on their roots. Ants find food and shelter in tree structures, while insects defend the trees from being eaten. However, not all symbiotic relationships are created equal.  Some interactions are specific, where one host pairs off with only one other species. Others are general and flexible. Specific relationships have advantages, allowing the two species to reap mutual benefits and co-evolve. But this type of partnership can also come with a cost,...