Increase body size and life cycle length. These factors tend to allow herbivores to subsist on lower quality foods. This allows the organisms to subsist by extracting less per unit of food. Obtain nitrogen from other sources such as occasional carnivory. This is a feature of lycaenid butterflies which often are tended by ants and feed upon their eggs and larvae simultaneously.
Many bugs can also pierce other insects and take advantage of their juices.
Symbiotic solutions Ruminants allow microbial fermentation in two chambered forestomach before sending the material down the intestines. This allows for breakdown of materials by microbes with the ruminants harvesting some of the microbial products. Rodents, lagomorphs, and some primates engage in this behavior. Bark beetles and some wasps will carry these ectosymbionts in external body pouches where they infect the plants. Detritivores such as leaf shredders provide prime examples of organisms that rely on mycophagy for a significant part of their diet.