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Ammonia, urea and uric acid are the major nitrogenous wastes excreted.Ammonia produced by metabolism is converted into urea in the liver of these animals and released into the blood which is filtered and excreted out by the kidneys.On an average, 25-30 gm of urea is excreted out per day.An adult human excretes, on an average, 1 to 5 litres of urine per day.Reptiles, birds, land snails and insects excrete nitrogenous wastes as uric acid in the form of pellet or paste with a minimum loss of water and are called uricotelic animals.Ammonia, urea and uric acid are the major forms of nitrogenous wastes excreted by the animals.All these metals are dangerous to humans because our body cannot excrete them.Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions.Mammals, many terrestrial amphibians and marine fishes mainly excrete urea and are called ureotelic animals.