This is especially a concern in herbivorous animals (see Photosensitivity in animals).
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Ingestion of pigments capable of producing singlet oxygen with activation by light can produce severe photosensitivity of skin (see phototoxicity, photosensitivity in humans, photodermatitis, phytophotodermatitis).
oxygen | Oxygen | Oxygen (TV channel) | Winkler test for dissolved oxygen | Project Oxygen | liquid oxygen | Theoretical oxygen demand | Oxygen Studios | Oxygen radical absorbance capacity | Oxygen-free copper | Liquid oxygen | Chemical oxygen demand | Carbonaceous biochemical oxygen demand | Biochemical Oxygen Demand | Biochemical oxygen demand |