INTRODUCTIONThe Laws of Nature and the Nature of Law

The Nile perch is among the largest of freshwater fish, capable of achieving a length of more than 6 feet and a weight of more than 400 pounds. The perch is native to the sub-Sahara and is found not only in the Nile but also in the Congo, the Niger, and other rivers, as well as in Lake Chad and other major basins. For more than half a century, however, it also has been found in Lake Victoria in east Africa, where it is not native, and where it has subsequently become one of the best-known examples of the unintended consequences of introducing a species to an ecosystem. A brilliant documentary by Hubert Sauper, Darwin’s Nightmare, made this story known to a wide public in 2004.

As a top-level ...

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