Bird Droppings Defy Expectations

These answers are based on the prevailing wisdom that ranks uric acid as the primary ingredient in bird "poop," which is comprised mostly of urine. (Birds release both solid and liquid waste at the same time. The white substance is the urine). But according to Nick Crouch, a scientist at The University of Texas at Austin, uric acid can't be the answer. That's because there is no uric acid in excreted bird urine.