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What kind of animal needs to get most of its calories from outside?
This is a kind of heterotrophs. Include chemical energy heterotrophs and optical energy heterotrophs.

Heterotrophs can't directly use inorganic materials to make organic matter, but can only convert the ready-made organic matter ingested from the outside into its own components and store energy.

There are few microorganisms in heterotrophs. It is a microorganism that uses light as energy and organic carbon compounds (formic acid, acetic acid, methanol, isopropanol, etc.) to grow and reproduce. ) as a carbon source and hydrogen donor for photosynthesis. Such as purple non-sulfur bacteria.

Chemotactic heterotrophs includes all animals and most bacteria. It is to use external organic matter as C source and energy to synthesize its own organic matter and store energy.