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I've observed this Hylemya vagans/nigrimana female during 32 minuts (14.24 to 14.56) feeding on an excrement (pic 1 ). Then she found a warm place on a dry leave (no wind and in the sun) . She began to bubble 3 minutes later (14.59), aspirated the bubble 1 minut later (15.00, pic 2), and then maked immediately another brown opaque bubble (15.00, pic 3).