Multiple choice Which of the following organisms release ammonia as a major excretory product? Land snails Bony fishes Birds Snakes Reveal answer Fill a bubble to check yourself B Correct answer Explanation Ammonia, urea and uric acid are the excretory products in different animals. Ammonia is an excretory product in gaseous form in fishes, uric acid (white in colour) is in birds and urea is an excretory product in human beings.