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This image shows small water creatures (Daphnia lumholtzi), 1.5 millimeters in length, that create relatively large disturbances in their surrounding water. Each animal swims somewhat differently, and, being of different sizes and shapes, creates species-specific disturbances similar to terrestrial animals moving in snow.
Optical techniques allow visualization of these "footprints." The creatures use these footprints to distinguish between predators, prey and mates.Image credit: Photo by J. Rudi Strickler, University of Wisconsin-Milwaukee
