15 Most Dangerous Animals in the Mississippi River You Never Knew Lived There

The Mississippi River looks calm and unremarkable from any bridge or boat ramp, but beneath its brown, murky water lies one of the most dangerous ecosystems in North America. In this countdown, we reveal 15 creatures hiding along its banks and beneath its surface — from tiny zebra mussels and disease-carrying ticks to bull sharks that have swum hundreds of miles inland, feral hogs, black bears, and even alligators lurking near the water's edge. You'll learn why the smallest animals on this list are often the deadliest, and why creatures like the copperhead, cottonmouth, and brown recluse spider are far more likely to cross your path than you'd expect. Stretching through ten states from Minnesota to the Gulf, this river hides more than most people realize.