Ammonia has only one nitrogen per molecule, but it is quite toxic. It requires a great deal of water to be flushed out of the body.
Reptiles including birds go one step further, packaging their nitrogenous waste as uric acid. That white stuff you see from a bird or a snake it has less water in the poop.
Bird guano contains uric acid, which is the primary biochemical compound found in the waste of birds. Uric acid helps birds excrete nitrogen waste in a concentrated form, allowing them to conserve water.
Mostly depends on the difference in foods eaten, and in case of birds, that their "plumbing" is quite different.
Urea is a soluble form of nitrogen waste produced in the liver from ammonia. It is the primary nitrogenous waste product in mammals and most terrestrial animals.
their waste
urea
The breakdown of DNA and RNA results in nitrogen waste product called urea.
It is just the way that birds evolved. Birds do not have a separate opening for the urinary tract so both uric acid and feces come out of the same opening. The uric acid is excreted as nitrogen waste.
Birds will either drop whatever they are carrying or their body waste.
Blast furnace waste gas is mainly nitrogen because nitrogen makes up about 78% of the atmosphere and is used as the primary gas for the blast furnace process. During the process, the injected air reacts with the fuel and iron ore to form nitrogen-rich waste gas.
Ammonia
yes
They have uric acid