Why I am on about this? Because I have been wracking by brain trying to think of puns involving krill and the baleen whales that eat them.
It turns out that people eat krill oil as a dietary supplement, which makes us share at least one thing with baleen whales. In Jedwards International, Inc. v. United States, the question presented to the U.S. Court of International Trade was the proper tariff classification of krill oil. The importer classified the merchandise in 1603.00.90 as "extract and juices of meat, fish or crustaceans . . . ." other than clam juice. This seems like a perfectly good description of the product, which, by the time it gets imported, contains nothing but natural components of the krill and a residual amount of ethanol from the production process. U.S. Customs and Border Protection disagreed and classified the merchandise in 3824.90.40 as a product of the chemical or allied industries, including several miscellaneous chemical products and preparation. To complicate matters, in Court, the plaintiff argued that the correct classification is as an animal fat or oil of Heading 1506 or 1517.
The Court easily eliminated Heading 3824, which is a basket provision for chemical products not elsewhere specified. Since the krill oil is described by at least one other heading, 3824 cannot apply.
To be classified in Chapter 15, the krill oil must be an "animal oil." This is where my limited knowledge of zoology might come in handy. I know, via Wikipedia, that krill are subject to the following taxonomical breakdown: