Living With Mayflies

SABULA, IA has a healthy population of mayflies. A mayfly swarm shut down a bridge into Illinois. Motorists stopped on the bridge accumulated mayflies up to the headlights. The police called out the snow mayfly plows

Mayflies are a bioindicator species for water quality. Apparently, the water quality there is good enough to produce an epic mayfly swarm.

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Source: Living With Insects Blog