Question

birds and insects excrete what

Answer 1

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste. Uricotelic organisms tend to excrete uric acid waste in the form of a white paste or powder.

Answer 2

Mammals, including humans, are the primary producers of urea. Because they secrete urea as the primary nitrogenous waste product.