Description
Thorold's deer is one of the largest deer species, with a shoulder height of around 115 to 140 centimetres (45 to 55 in). Males, which typically weigh from 180 to 230 kilograms (400 to 510 lb), are significantly larger than females, at 90 to 160 kilograms (200 to 350 lb) in weight. The hair is coarse and grey-brown over most of the body, fading to yellowish buff on the underparts, with a distinct reddish-brown patch on the rump, and a ridge of darker hair running down the spine. During winter, the coat is paler, and about twice as thick as during the summer, being thicker even that of a moose. The head is darker than the rest of the body, especially in males, and contrasts with pure white markings on the lips, around the nose, and the throat just below the chin.
Adult male Thorold's deer have antlers, measuring up to 110 centimetres (43 in) in beam length, and weighing up to 4 kilograms (8.8 lb). Compared with those of wapiti or red deer, the antlers are flattened with the first and second ("bez") tines noticeably far apart. The antlers can have up to seven tines, which all lie in the same plane. They are shed annually in March, reaching their full length by late summer. Other distinctive features include longer ears than most other deer, lined with white hair, and large metatarsal and preorbital glands. The hooves are broad and heavy, with unusually long dewclaws. The tail is short, at 12 to 13 centimetres (4.7 to 5.1 in) in length.
Thorold's deer has a number of physical and physiological adaptations to its high altitude environment. The short legs and broad hooves make it an agile climber, able to use steep mountainous terrain to escape predators. The nasal cavities are unusually large, allowing it to breathe in rarified high altitude air, while the thick hair protects against the cold. The red blood cells in this species are smaller than average for similarly sized mammals, and are very numerous, both features that increase its ability to take up limited amounts of oxygen.
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