Abstract: A group of rare and endangered species was segregated within the game and non-game mammals of the USSR. Some species in the group were formerly referred to game species. But due to over-hunting and the absence of measures aimed at their reproduction the population dropped sharply. Mammal fauna of the USSR includes more than 80 species that require special protection. The Red list of IUCN includes, among the others, white bear, Transcaucasian sub-species of brown bear, Amur and Turan tigers, snow leopard, Caucasian and Amur leopards, caracal, cheetah, Tien-Shan and Ussuri sub-species of dhole, Atlantic walrus, island seal, kulan, Bukhara red deer, New Land reindeer, goitered gazelle, Menzbier's marmot.

Abstract: A review of history of creation of the Red Book, International Red List, and Red Data Book of the USSR, Red Data Books of Soviet Republics is made. Snow leopard (with a total population of 10 animals) is included in the Red Data Book of the Uzbek SSR as an endangered species. The author gives the examples of careless attitude to plants and animas resulting in decrease of their populations or even extermination.