Fungi and animals have some commonalities. First, both are living organisms made up of complex eukaryotic cells. This means that their cells contain many different organelles with specific functions that keep the cell running smoothly. Second, both fungi and animals need the sun's energy to live but are unable to directly harness it through photosynthesis. This means they are both heterotrophic and must take in energy-rich nutrients from organic matter. Animals find and eat their food, while fungi absorb their nutrients through decomposition.