The Digestive Tract on the board contains spaces for Stomach cards, each marked with a number from 1 to 7. These are there to help you determine which card is the target for your actions.
Whenever there is an empty space in the Digestive Tract, immediately slide the next cards towards you to fill the gap. If there are empty spaces at the end of the Tract, do not refill them. They will be refilled during the Beast’s turn.