While walking along the Illinois River this morning, I heard a grunting noise. The grunting noise was coming from some logs and boards in the river. I decided to investigate. At first I thought the boards and logs rubbing against each other caused the sound. Upon closer inspection I discovered the source of the sound: carp sucking (eating algae?) or chewing the underside of the wood. I have included photographic evidence of my findings. Unfortunately, I did not bring my fancy recording device so I cannot offer audible evidence.
In the bottom photograph the carp is upside down so it can mouth the wood.
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