“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.”

— August Krogh

A. Krogh (1929). The progress of physiology, American Journal of Physiology 90:243–251.
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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August Krogh1

Danish physiologist 1874–1949

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