This is an educational audiobook for children in which they will learn about the excretory system and the organs that make it up. The excretory system is formed by the urinary system and the sweat glands. Its function is to get rid of substances that the body does not need. The main organs of the urinary system are the kidneys. They are dark red, bean-shaped and are responsible for filtering waste from the blood. We also have the bladder, which is a balloon-shaped organ that stores urine. Once it is full, the urine travels out of the body through a tube called the urethra. Finally, we have the skin. Under the skin we can find the sweat glands, which are also responsible for filtering waste from the blood by expelling sweat. This is a very useful and interesting resource for children. It is perfect for teaching how the excretory system works. It is an excellent audiobook for primary education.