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Some animals have developed the ability to excrete nitrogenous waste largely in teh form of uric acid, which is nontoxic and does not require large amounts of water for its excretion. Considering its lifestyle, what animal would excrete nitrogen primarily in the form of uric acid?
A. Wild pig
B. Flying Bird
C. Carnivorous shark
D. Herbivorous bony fish
Answer: B
The solution states
Species of flying birds have evolved many characteristics that reduce their overall body mass, including the ability to excrete nitrogenous waste in the form of uric acid. Because the excretion of uric acid does not require large amounts of water, the amount of water that birds must ingest is decreased, making the birds lighter. Thus B is the best answer.
So is this common knowledge or something? Or did I miss something in my content review? I don't understand how we were supposed to figure this out. Any help?