How is nitrogen stored in animals?

Nitrogen in animals is primarily stored in the form of amino acids, which are the building blocks of proteins. When animals consume food, they break down proteins into amino acids, which are then used to synthesize their own proteins or converted into other nitrogen-containing compounds. Additionally, excess nitrogen is often excreted as urea in mammals or uric acid in birds and reptiles, helping to regulate nitrogen levels in the body. This process ensures that animals maintain an adequate supply of nitrogen for essential biological functions.