The light way

2019-03-07 04:02:13

SPIDERS trying to find their way home after foraging trips may use polarised light as a compass. Marie Dacke of the University of Lund in Sweden and her colleagues studied the spider Drassodes cupreus and found that two of its eight eyes have built-in filters that allow them to detect the polarisation of light. The animals managed to find their way back to their nests after foraging around Petri dishes under polarised light in the laboratory. Under unpolarised light, however, their navigation was no better than random (Nature,