Four and a half year old Kodaly asked his dad, "Where does poo come from?" Unfortunatly dad was a nerd, "Well son it all begins with the sense of smell a taste. Acceptable smells and tastes allow for the injestion of proper food. In fact the bitter taste of alkoloids which often are poison are rejected. When the food reaches the stomach enzymes and even strong acids are added via secretion and allowed to pass further into the digestive tract to be acted upon by the liver, gall bladder and pancreas where the far flung islets of langerhans...
BUT DADDY - WHAT HAPPENED TO POOH, TIGER AND PIGLET??
Just a minute son, I haven't even gotten to the colon...wha?"