The word 'herbivory' is correct and commonly used in written English.
It refers to the behavior or diet of animals that only eat plants. Example: "The population of herbivores in the savanna is declining due to drought, causing a decrease in herbivory on the local flora."
Although lizards are often portrayed as insectivores, many also consume small vertebrates and at least some plant material; strict herbivory has evolved independently in several groups of lizards.
The most striking deviation from the typical Iguanian consumptive pattern is the evolution of herbivory in lizards, which occurred independently in several lineages.
Similar to most members of the family Cactaceae, thick mucilage within its flesh decreases water loss and may deter herbivory.
Pleurodires are predominantly omnivores, but herbivory and carnivory occur among the more than 70 species of sidenecks.
Vertebrate herbivory may result in changes in tundra vegetation through selective feeding on preferred plant species, trampling, and recycling of soil nutrients through excretion.
However, large body size is not necessary for herbivory (many small herbivorous species in the genus Liolaemus exist), and the very largest lizards, such as the Komodo dragon (Varanus komodoensis) and other monitor lizards, are carnivorous.
Animals had barely evolved herbivory, the habit of eating live plants, and instead subsisted on putrefying remains in the fetid swamp.
Plant and animals do not evolve in isolation, and this huge shift in herbivory would have resulted in changes to the relative evolutionary successes of the different plant survivors, as the Earth become ever more like the one we recognise today.
Chris has talked about pandas being an evolutionary cul-de-sac, and it's certainly unusual for a carnivore to take up herbivory.
"And now the only known case of spider herbivory depends on this interdependence".
