USDA APHIS quarantine requirements govern the importation of live animals that fall outside more precisely defined SITC headings — a catch-all that can encompass exotic species, zoo animals, and other fauna not classified under standard livestock or poultry categories. CITES permits may be required for protected species, and importers must coordinate with both APHIS and, where applicable, the US Fish and Wildlife Service before shipment. Classification into this residual heading is itself a compliance trigger: if a more specific SITC or HTS provision exists for the animal in question, that provision takes precedence.

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