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A carpet of small shells, each about 2.5 centimetres diameter, covered the surface of the water. "It struck me as odd," recalled Ohlke. The odour of decay was powerful and pungent, so Ohlke took a ...

A major die-off of freshwater snails in an eastern Ontario lake has stirred up attention from zoologists and environmental scientists. In mid-May, high school art teacher Katie Ohlke was paddling her ...