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Two bull sharks swam up the Mississippi River to St. Louis (DIY determination)

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https://gizmodo.com/two-bull-sharks-swam...1847300882

EXCERPT: Bull sharks are coastal creatures, but at least two of the animals were able to make it as far inland as St. Louis by swimming up the Mississippi River, according to a team of researchers who looked at the shark’s fossil record and reported sightings over the years.

The research duo—Ryan Shell, a paleontologist at the Cincinnati Museum Center and Nicholas Gardner, a librarian at WVU Potomac State College with degrees in ecology and evolutionary biology—scrutinized hundreds of reports of sharks in the Mississippi River and compared those historical records with archaeological and paleontological evidence for bull sharks moving in those waterways in the distant past. Their results were published in the journal Marine & Fishery Sciences.

“I believe Ryan mentioned something like ‘hey, bull sharks can go up the Mississippi,’ and my first thought was, ‘bull****,’” Gardner wrote in an email.

The sharks are known to make forays into freshwater beyond the African, Asian, Australian, and American coasts they inhabit, and the fossil record holds evidence of bull sharks in the river, but not in its upper basin. Some teeth are found inland, but not in natural fossil beds and in association with teeth from other species, suggesting they may have been traded inland.

No sightings are documented before the turn of the 20th century, but Shell and Gardner found two confirmed bull shark catches in the historical record: One in 1937, in Alton, Illinois, and another just outside of St. Louis in 1995... (MORE - details)
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