Plant-Eating Reptiles and Their Specific Needs
Herbivorous reptiles get most or all of their calories and nutrients from plants. This includes iguanas, uromastyx, most tortoises, chuckwallas, and many species of agama and skink. Plant-eating reptiles share several husbandry concerns that don't apply to insectivores or carnivores: critical calcium-to-phosphorus balance in food selection, high fiber requirements, strict avoidance of high-protein foods, and frequent meals (most herbivores eat daily, sometimes multiple times daily as juveniles).
Diet construction matters more for herbivores than any other reptile group. A bearded dragon fed wrong (too much protein, too few greens, low-quality lettuce as filler) develops gout and kidney disease over years. A green iguana fed wrong develops metabolic bone disease, jaw deformities, and shortened lifespan. The reverse is also true — a well-fed herbivore in proper conditions easily outlives its less-carefully-fed counterparts by years or decades.
Most pet herbivorous reptiles require strong UVB lighting to synthesize vitamin D3, which they need to absorb dietary calcium. Without UVB, even perfect dietary calcium goes unused. UVB requirements vary by species — desert species need stronger bulbs at closer basking distances than tropical species. The Ferguson Zone system on each species profile gives specific UVB targets.
Captive herbivores tend toward obesity. Their wild counterparts forage actively across territories and burn calories that captive animals don't. Adjust portion size and frequency based on body condition, not appetite — most herbivores will overeat if offered unlimited food. Active herbivores like uromastyx and chuckwallas need enclosure space sufficient for foraging behavior, not just resting.