Birds secrete uric acid as their nitrogenous waste because uric acid

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Uric acid requires very little water for its excretion, thus reducing body mass. This is important for birds because they have to be as lightweight as possible for flight, and the ability to conserve water is especially advantageous for birds living in desert environments. While uric acid is more expensive to synthesize metabolically, it still provides a significant benefit for birds that outweighs the cost.

Birds Secrete Uric Acid as Their Nitrogenous Waste Because Uric