Experiment!
( item after conveyor is a purifier which makes rock sell for more, the one that costs $500)
(And the item on the very right is one that automatically spawns rocks once you click it to activate it once it’s built)
Thanks, managed to figure it out after some messing around I think there might be a bug if you have more than 1 maneater as i think what one does they all do which bugs the game out as they all happen at the same time
Edit: they also seem to just stop being interactable after an event as their hunger bar can be maxed out and nothing will appear over them