This year's mayfly hatch in the Mississippi River reached Biblical proportions.
The mayfly emergence is an annual event in which mayflies leave the Mississippi River after one or two years of incubation. The flies live for up to 36 hours before they return to the water, lay a new crop of eggs, and die.
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Wisconsin residents captured some stunning — read: horrifying — images of the mayfly emergence, which happened on Sunday night. Check out the swarm below. --Meghan DeMaria
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