>>10083260We know of the fruit of Vuata Maca trees, Ga-Matoran also fish. They also most likely eat other types of fruits or plants, but we don't know if they eat meat other than fish. They can also absorb Amana Volo spheres which are floating orbs of elemental energy. And we know that some species of Rahi hunt other species for food. All beings need water or liquid protodermis too.
Sentient species have working digestive systems but they absorb the energy from food through their hands, Skakdi though choose to swallow food through their mouths to induce fear in their enemies.
But the real question is: Do they poop?