Polar bears are not native to the Mississippi River, as they inhabit the Arctic regions instead.

Polar bears are not native to the Mississippi River. These majestic animals are found in the cold, Arctic regions, far from the warmer waters of the Mississippi River. In contrast, species like the alligator, river otter, and invasive Asian carp are native or have adapted to the river's ecosystem. The presence of polar bears in the Mississippi River is highly unlikely due to their natural habitat in the far north.