The undersides are paler, and, in the winter, mature males becoming much darker with white patches. There is usually a stripe of darker hair down the centre of the back and onto the tail, and some males have saddle-like patches on the back in the winter. The colouration is also variable, from dark brown to light tan, with some reddish individuals. The exact shape of the horns varies considerably between individuals. Both sexes have circular rings around their horns that represent annual growth, but males also have large transverse ridges along the front surface. Those of fully-grown males are black and typically measure about 115 cm (45 in), although in extreme cases they can grow to 148 cm (58 in). The female's horns are relatively small, and grey-brown in colour, measuring an average of 27 cm (11 in) long. The coat of Siberian ibex is well suited for camouflage in mountains with low or no vegetation.
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