[RajT88]

Totally wild factoid: Bull sharks have been caught in tributaries of the Mississippi River in Illinois. (Back before they built all the dams)

[dragonwriter]

Yeah, bull sharks are the most common and wide-ranging of the sharks that are adapted to survive in a wide range of salinity levels.

[cucumber3732842]

That's the kind of rare and highly luck based curiosity they ought to give you a plaque for. "From this shore in 1973 local angler..." Slap it on the same sign post as the flood high water markers they put up.

[darkteflon]

Bull sharks are often found in rivers tens of kilometres from the ocean in Queensland.