These animals are preserved now only in zoos The endangered species of animals conservation and their reintroduction into the wild is one of the main aims of the zoos. Some animal species such as the Przewalski's wild horse and Pere david's deer remained living only in zoos (photo pere david's deer in the Moscow zoo – "These animal have remained only in zoos"). There is also successful experience of releasing of captive bred animals into the wild – reintroduction. Thus, natural populations of Arabian oryx, lion's tamarin, Californian condor and a number of other species were restored. The Moscow zoo has the positive reintroduction experience of amphibians. Unlike birds and mammals it is possible to breed amphibians in captivity in a number, sufficient for restoring natural populations.

Since 1982 the specialists of the Scientific Research Department of the Moscow zoo have taken part in activities of Workgroup on breeding in captivity endangered, vanishing and "problem" species of amphibians. They managed to work out an universal method of hormonal stimulation of amphibian spawning and have bred in captivity the majority of amphibian species put in "The Red Book of the USSR". Three species: Eastern spadefoot (Pelobates syriacus), banded newt (Triturus vittatus) and Karelin newt (Triturus karelinii) were successfully reintroduced into the wild, where have generated new wild populations. However, in most cases single zoo can not maintain a number of individuals of one species enough for successful breeding without inbreeding. It can be achieved only through the cooperative efforts of many zoos, that have established a kind of "zoo" populations of endangered species in captivity. In such populations all the pedigrees and histories of life are carefully registered. The optimal pairs for reproduction are formed on the basis of the geneticist's guidelines. This activity requires careful coordination and close collaboration of zoos, participating in it. The most successful and known form of such organization is European programs on breeding of endangered animal species (ЕЕР). The steller's sea eagle was bred for the first time in the Moscow zoo. Now Moscow zoo participates in 44 EEP programs. These programs on birds are: humboldt penguin (spheniscus humboldti), hermit ibis (geronticus eremita), dalmatian pelican (pelecanus crispus), the black stork (ciconia nigra), cinereous vulture (aegypius monachus), andean condor (vultur gryphus), bearded vulture (gypaetus barbatus), white-tailed sea eagle (haliaeetus albicilla), steller's sea eagle (haliaeetus pelagicus pelagicus) (photo steller's sea eagle for the first time in the world was bred in the moscow zoo), manchurian crane (grus japonensis), white-naped crane (grus vipio), victoria crowned pigeon (goura victoria), hyacinth macaw (anodorhynchus hyacinthinus), military macaw(ara militaris). EEP programs on mammals are: kowari (dasyuroides byrnei), ring-tailed lemur (lemur catta), ruffed lemur (lemur variegatus rubra), pale-headed saki (pithecia pithecia), lion-tailed macaque (macaca silenus), mandrill (papio sphinx), diana monkey (cercopithecus diana diana), black lemur (lemur macaco albifrons), orangutan (pongo pygmaeus) (photo 24 uneasy to generate a pair of these large humanoid monkeys, it needs all experience of the employees of a primat department), western lowland gorilla (gorilla gorilla gorilla), two-toed sloth (choloepus didactylus), maned wolf (chrysocyon brachyurus), hunting dog (lycaon pictus), spectacled bear (tremarctos ornatus), asiatic black bear (selenarctos thibetanus), european mink (mustela lutreola), european otter (lutra lutra), amur leopard (panthera pardus orientalis), asian lion (panthera leo persica) (photo this male asian lion has arrived in moscow zoo on program еер), siberian tiger (panthera tigris altaica) (photo 2. The Siberia tigers in a zoo are regularly breed), snow leopard (panthera uncia) (photo 37. Snow leopard in new enclosures having hidden observes of audience), cheetah (acinonyx jubatus) (photo 39. Cheetah – one of most graceful creations of a nature), indian elephant (elephas maximus), african elephant (loxodonta africana), przewalski's wild horse (equus przewalskii), onagr (equus hemionus holdereri), grevy's zebra (equus grevyi), reticulated giraffe (giraffa camelopardalis reticulata), bongo (tragelaphus eurycerus isaaci), musk ox (ovibos moschatus). Amur tiger and Amur leopard are among the most endangered animals of our country. Moscow zoo successfully breeds these animals, as well as participates in development of Russian Federation strategy on protection of these endangered species. Working in the nature, both in Russia or abroad, the specialists of our zoo study ecological peculiarities, estimate the number and state of populations of endangered and poorly investigated species: Caucasian (Mertensiella caucasica) and Siberian salamanders (Onychodactylus fischeri), Boelen's python (Python boeleni) and others.

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