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The wild boar are well equipped for winter. From autumn onwards they have grown a very dense undercoat or down hairs that extend to the ears and are pleasantly warmth-holding. The outer coat or top hairs are long and bristle-like, leaving an impression of  brownish-black or dark grey as the camera shows. A line of long bristles runs from the forehead and along the back; they rise on irritation or other disturbances – from where has our expression  " bristling back“ come?

 

The summer coat of wild boar is considerably lighter in colour.