For a large number of problems there will be some animal of choice or a few such animals on which it can be most conveniently studied.

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Notes from Wikiquote

See Krogh Principle | Famously quoted by an important microbiologist in: Krebs H. A. (1975). The August Krogh Principle: "For many problems there is an animal on which it can be most conveniently studied." Journal of Experimental Zoology 194:221–226.

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Quote text and notes from Wikiquote: August Krogh (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.