Pond dwellers called Euglena swim in polygons to avoid light

Tuesday, September 25, 2018 - 07:20 in Astronomy & Space

In any seemingly quiet pond the still waters actually teem with tiny pond dwellers called Euglena gracilis. Unseen to the naked eye, the single-celled organism spirals through the water, pulled along a relatively straight path by a whiplike appendage in search of just the right level of light.

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