proteins and nucleic acid :)
Feces and urine
excretory system by Jeff hirst skyline
other wise they accumulate in the body and cause death.
Urea
kidney, skin,
urethra
Just like other mammals .
Mammals have nervous, digestive, circulatory, skeletal, immune, muscular, integumentary, and excretory systems.
The excretory system of meerkats is similar to that of other mammals. They have kidneys and a urinary bladder, and their urine is liquid.
It is a major nitrogenous end product of protein metabolism and is the chief nitrogenous component of the urine in mammals and other organisms. It has various applications in many fields such as agriculture, chemical industries, medical use, and other areas.
Birds, unlike mammals, don't produce urine. Instead they excrete nitrogenous wastes in the form of uric acid, which emerges as a white paste.
uric acid, mammals do it in the form of urea, this process is to ensure that little water is lost