While females and juveniles are orange to tawny, males are much darker – their coat is typically bluish grey. The ventral parts, the insides of the thighs and the tail are all white.  A white stripe extends from the underbelly and broadens as it approaches the rump , forming a patch lined with dark hair.  Almost white, though not albino , individuals have been observed in the Sariska National Park ( Rajasthan , India)  while individuals with white patches have been recorded at zoos.  The hairs, typically 23–28 centimetres (– in) long, are fragile and brittle.  Males have thicker skin on their head and neck that protect them in fights.  The coat is not well-insulated with fat during winter, and consequently severe cold might be fatal for the nilgai.