What is the primary nitrogenous waste product excreted by birds, reptiles, and insects to conserve water?

💡 Solution & Explanation

Animals such as birds, reptiles, and insects excrete uric acid because it is relatively nontoxic and can be eliminated as a thick paste or semi-solid pellet with minimal water loss. Other nitrogenous wastes like ammonia require vast amounts of water for safe dilution, while urea requires moderate water excretion.