“Although living in such remote and sequestered regions, the Thibetan Antelope is wary in its habits. In the mornings and evenings it frequents the grassy margins of glacial streams, which frequently flow between steep banks gradually scarped out by the floods of centuries and now remote from the ordinary water’s edge. The ravines have, for the most part, been cut through gently sloping valleys; and on ascending their steep sides, slightly undulating plains will be found to stretch away, until they merge in the easy slopes of the rounded hills which bound the valley. To these plains the Antelope betake themselves during the day, and there they excavate hollows deep enough to conceal their bodies, from which, themselves unperceived, they can detect any threatening danger at a great distance. In addition to the concealment afforded by their ‘shelter pits,’ they have an additional safeguard against surprise in the constant _mirage_ which prevails on these stony wastes during the bright hours of the day. This _mirage_ not only distorts all visible objects in an extraordinary manner, but, like rippling water, refracts the rays of light to such a degree as to render objects altogether invisible at very short distances. It is, of course, worst near the surface of the ground, but on very hot days it attains a level of several feet; and I well remember, on one occasion, observing the slender horns of an Antelope gliding past me within three hundred yards, apparently borne on the surface of a glassy stream, in which the wearer of the horns was submerged and completely hidden from view! When Antelope are feeding on the grassy flats by the streams is the time when they may be easily approached; and then a knowledge of the ground, and of the habits of the animal, renders success in stalking them tolerably certain.” How far the Chiru extends into the high plateau of Northern Asia beyond the Himalayas it is yet a little uncertain. Dr. Blanford, in his account of the mammals collected by Stoliczka during the Second Yarkand Mission (where excellent coloured figures of both sexes of this Antelope are given), tells us that it has been found in the Kuen-lun range, but has not been met with further north-west or west. It is also, as we are told by the great Russian traveller and naturalist Przewalski, a characteristic animal of the highlands of Northern Tibet. The “Orongo,” as it is here called by the Monguls and Tanguts, was first met with by the great traveller after crossing the Burkhan Buddha range, beyond which it was found distributed to the south as far as the Tang-la mountains. In Mr. Delmar Morgan’s translation of Przewalski’s travels will be found the following passages relating to the habits of this animal, of which, in the original Russian edition of the work, both sexes are figured:--