Cinematic 8K 7680×4320.Only cirrus clouds in the blue sky. Fibrous clouds are similar to cirrus uncinus, commonly known as mares tails however, fibratus clouds do not have tufts or hooks at the end.Cirrus is a genus of atmospheric white cloud generally characterized by thin, wispy strands, giving the type its name from the Latin word cirrus meaning a ringlet or curling lock of hair. Air meteorology dark space time lapse partly cloudy fluffy atmosphere group parallel sunny wind windy.