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[[Image:Lizard_feces_uric_acid.jpg|300px|thumb|right|'''Lizard feces (black material) and uric acid (white cast)''' (Wikicommons)]]
Lizards and snakes are different to mammals in several aspects of nitrogenous excretion. Uric acid is the primary nitrogenous waste product of most reptilian species.
Lizards and snakes are different to mammals in several aspects of nitrogenous excretion. Uric acid is the primary nitrogenous waste product of most reptilian species.