Autotrophs are organisms that can produce their own food from inorganic substances using light or chemical energy. However, animals are generally heterotrophs, meaning they rely on consuming other organisms for their energy and nutrients. There are no known animals that are autotrophs. Animals typically obtain their energy by eating plants, other animals, or organic matter. While some animals, like certain species of sea slugs, can incorporate chloroplasts from the algae they eat and use them for photosynthesis, they still rely on consuming other organisms to obtain these chloroplasts and cannot produce their own food entirely on their own.
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