A residual catch-all for animal-derived oils, fats, and fractions not specifically named elsewhere in the schedule — covering products such as rendered poultry fat, horse fat, and certain marine mammal oils that lack their own dedicated heading. The 'not chemically modified' condition is a hard classification boundary: hydrogenation, interesterification, or other chemical transformations move the product to a different chapter. Because this heading spans a wide range of animal sources, importers must be prepared to document the species of origin, as USDA FSIS or FDA oversight may apply depending on whether the source animal is a food species and the intended end use.

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