If an intelligent species had nothing to compare eating with, they might derive energy from other sources like:

1.  Chemosynthesis - using chemicals as a source of energy instead of sunlight, as seen in certain deep-sea organisms.
    
2.  Geothermal energy - utilizing the heat from within the planet to generate energy.
    
3.  Tidal energy - harnessing the energy from ocean tides.
    
4.  Wind energy - using wind to generate energy.
    
5.  Nuclear energy - using nuclear reactions to generate energy.
    
6.  Solar energy - using sunlight to generate energy.
    

Each of these energy sources could potentially sustain an intelligent species, depending on their specific environment and needs.
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