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Zambezi sharks are one of the world’s most dangerous predators. Essentially saltwater creatures, they have been known to swim more than six hundred miles upriver in search of prey. They thrive in shallow, murky waters and are particularly prevalent in my hometown of Durban, where they account for a very high percentage of attacks and fatalities. These days large nets strung out three hundred yards from shore protect the beach goers in Durban. But back in 1957, during a month now referred to as “Dark December,” seven swimmers were attacked by Zambezi sharks and five of them died.