Create a subrule of the rule “Moods” called “Satisfaction”:

Each creature has a Satisfaction Level, which is tracked in the Map of the Habitat page and indicates how well the creature’s needs are being met.  Satisfaction Level may be a number between 1 and 5 inclusive, which can also be referred to using a name as described below.  If Satisfaction Level should ever become less than 1, it is set to 1 instead.  If it should ever become greater than 5, it is set to 5 instead.

Satisfaction Levels:
* 1: “Depressed”
* 2: “Down”
* 3: “Satisfied”
* 4: “Happy”
* 5: “Fulfilled”

Add to the end bullet point beginning with “Beak” in the “Anatomy” rule:

This action fulfills Hunger.

Add to the end of the paragraph beginning with “As a daily communal action, any Organ may “gather ambient nutrients”“:

Gathering ambient nutrients fulfills Hunger.

Replace the paragraph in the “Moods” rule beginning with “Actions can “fulfill” a creature’s moods.” with:

Actions can “fullfill” a creature’s moods. If an action fullfills a mood, and that mood is the highest or tied for the highest of that creature’s moods, that mood decreases by one, and the organ may take up to 2 nutrients from the statolith, if the statolith has them, and its creature’s Satisfaction Level increases by 1. If the action taken adds nutrients to the statolith, those nutrients must be added before the organ attempts to take any.  If the statolith does not have any nutrients when nutrients would be taken as a result of fulfilling a mood, its hunger mood increases by 5.

Add an additional paragraph to “Moods”:

If an action fulfills a mood and that mood is not the highest or tied for highest of that creature’s mood’s, then the organ’s creature’s satisfaction level decreases by 1.

Set all creatures’ satisfaction levels to 3.