UV-B light exposure is a critical welfare requirement for many reptile species that is frequently inadequate in captivity, causing metabolic bone disease and chronic suffering.
UV-B deficiency is one of the most common and most preventable sources of chronic suffering in captive reptiles. The gradual onset of metabolic bone disease means animals may suffer for months before obvious symptoms prompt veterinary attention. By the time pathological fractures occur, the animal has experienced prolonged nutritional suffering. UV-B bulb replacement is a simple, affordable intervention with profound welfare impact, yet many reptile owners are unaware that UV-B bulbs lose output before visibly failing. The Ferguson Zone system has provided a scientific framework for species-appropriate UV-B provision that should be standard knowledge for all reptile keepers.