Detritivores primarily feed on decomposing organic matter and nutrient-rich detritus found in the environment. This group of organisms includes earthworms, certain fungi, and various small invertebrates that break down dead plant and animal materials. By consuming this decomposing material, detritivores play a crucial role in nutrient cycling, enhancing soil fertility and promoting the growth of plants. Their activity helps to decompose complex organic substances, converting them into simpler forms that can be utilized by other organisms, thus highlighting their importance in ecosystems.