Formozov A.N. (1952). Tiger and snow leopard.
Abstract: Over the last decades tiger, leopard and snow leopard were fully exterminated in many areas, where they formerly were common species and now became very rare ones. Few leopards can still be found in Caucasus, Copet-Dag (Turkmenistan) and south of Primorskiy krai. Irbis is remaining a common species only in the difficult-of-access highland areas of Tien Shan and very rare in the Altai. Tiger traces are sometimes found in the Amudarya river valley and in the taiga Sihote-Alinya in the Far East.
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Severtsov N.A. (1953). Animals. Mammalia. Typical mountain animals. Taxonomic tables of the Turkistan fauna.
Abstract: Geo-botanic and zoogeographical description of altitude landscape zones of Central Asia is given. Snow leopard (Felis irbis), ibex (Capra sibirica), brown bear (Ursus leuconyx), dhole (Canis alpinus) and others (10 species in total) are vertically distributed (2,348 3,048 m) in the deciduous forest, fir forest and alpine meadow zones.
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Egorov O.V. (1955). Enemies, infections, parasites and mortality rate of ibex (Vol. Vol. 42.).
Abstract: Reasons for ibex and argali mortality from natural enemies, parasites, infections, accidents, and hunters are analyzed. Snow leopard is one of the most dangerous enemies of ibex and argali, preying equally on both young and mature animals (mostly males). Snow leopard feeds upon ibex all year round. Unlike wolf, snow leopard would never kill several animals at a time, but only one selected victim. The food remains left by these predators are different in terms of the skull gnawing. Nasal bones and eye-sockets on the skull of ibex killed by snow leopard remain undamaged, while wolf gnaws off nasal part of the skull, breaks eye-sockets, eats lower jaw, widens occipital hole and pulls out brains. Snow leopard leaves large pieces of skin around the skeleton of the victim, whereas wolf tears it to shreds or eats up fully. Sometimes parts of the victim left by snow leopard are eaten by wolf. It is easy to mix the remains of snow leopard's or griffon vulture's food. The remains differ in skin being turned inside out rather than torn to large pieces.
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Korelov M.N. (1956). The vertebrates of Bostandyk region.
Abstract: Data about faunistic complexes of Bostandyk region is provided. Snow leopard inhabited in high mountains of Chatkal, Pskem and Ugam ridges. The tracks of irbis were recorded in the snowfield near the edge of Pskem ridge (upper Ichnach-say river).
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Novikov G.A. (1956). Sub-genus UNCIA Gray.
Abstract: Identification features of the sub-genus Uncia (colour; length of body and tail; shoulder height, and skull measurements) are given. Distribution, habitat, way of life, reproduction biology, behavioural patterns, migration routes, commercial value of snow leopard in the USSR is described.
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Zheleznyakov D.F. (1958). Order Predators (Vol. Edition 1.).
Abstract: Data about distribution of stone marten, ermine, weasel, badger, bear, wolf, fox, and snow leopard in the Chatkal nature reserve is provided. In Tien Shan, snow leopard is not a rare species, and even a rather common species in some places. In the nature reserve, snow leopard was observed near the mountain Kurgan-Tash in 1948.
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Zakhidov T.Z. (1960). Irbis (Felis uncia) Ilvrs.
Abstract: The author provides information about snow leopard taxonomy, distribution, habitat and appearance. Biology of this animal is understudied. Snow leopard is able to make long jumps. It feeds upon ibex, wild sheep, marmots, partridge, and sometimes livestock, but never man. Gestation period is three months, at the end of May female gives birth to two or three cubs. Being very occasional, purchase of skin is of no practical value.
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Bogdanov O.P. (1961). Snow leopard (Felis uncia).
Abstract: In Uzbekistan, this species is distributed in spurs of Tien Shan and Gissar. It preys on ibex, rarer on argalis, roe-deers, young wild boars. In winter, it attacks livestock and sometimes feeds upon marmots and smaller rodents. Snow leopard attacks man very rarely, only when wounded. The economic significance of this species is low, since only few skins are traded. Its dressed skins are used as rugs.
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Ishunin G.I. (1961). Irbis, or snow leopard Felis (Uncia) uncia S¤hr†b†a 1778 (Vol. Vol. 3.).
Abstract: It describes diagnostic signs and taxonomy of snow leopard as well as its distribution, behavioral patterns and use in Uzbekistan. This predator inhabits the Ugam, Pskem, Chatkal, Turkistan, and Gissar ridges. It mainly preys on ibex, and marmots, vole-mouse, and snow-cocks. Sometimes it attacks domestic sheep. Snow leopard is of low commercial value. The cost of skin is 4 roubles 70 kopecks. Only a few skins are purchased.
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Kolosov A.M. (1961). Snow leopard, or irbis, – Felis uncia Schreb.
Abstract: It describes appearance, distribution and behavioral patterns of snow leopard in the USSR. The predator inhabits the mountains of Kyrgyzstan, Kazakhstan, Tajikistan, and the Altai and mainly feeds upon ungulates, and also snow-cocks, marmots, small birds, and rodents. Sometimes attacks sheep. Number of snow leopards is very low.
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