What creates these small, sand, chimneys on the flow-facing surface of boulders? These were found in Rio Bella Vista, a fast-moving, cold, cascading stream in Las Alturas.
Chimney building aquatic insect
What creates these small, sand, chimneys on the flow-facing surface of boulders? These were found in Rio Bella Vista, a fast-moving, cold, cascading stream in Las Alturas.