Question

what do birds excrete

Answer 1

All birds excrete uric acid.So they are called ureotelic animals.Ex:aves.

Answer 2

Birds excrete that white pasty stuff instead of separately urinating and defecating like mammals do. ... Mammals turn it into urea and urinate it out. Birds and reptiles turn it into uric acid. Birds have a chamber called a cloaca where digestive wastes, uric acid, and eggs or sperm go before leaving the body.