Add a subrule to ‘Carrying’, “Dropping and Using”:

To ‘drop’ an object is to cease carrying it. To ‘give’ an object to another Ant or Creature is to cease carrying it, and make that Ant or Creature start carrying it. An Ant may drop the object they are carrying at any time. Any Ant may give the object they are carrying to another Ant, provided that the latter is not currently carrying anything and is able to carry the object.

An Ant who is Underground may drop a Leaf to start carrying Mould. Any Ant may drop Mould or a Crumb to distribute up to 5 food among all Ants in their location, including themself, or drop Sugar to distribute up to 8 food.