Zoological parks of national importance are nature conservation, cultural, educational and scientific research institutions. More than 700,000 individuals representing 3,000 species of mammals, birds, reptiles and amphibians are kept in zoos around the world today. The main focus in zoos is on preserving “charismatic fauna” (pandas, elephants, giraffes, tigers, primates, and others). The experience of returning to nature species preserved in zoos is accumulating. In Sweden, Germany, Austria, France, after breeding in captivity, lynx were reintroduced into the forests. In 1995, the United States began a program to reintroduce gray wolves into Yellowstone National Park in order to restore the balance between predators and herbivores that existed in this region before human intervention. The contribution of zoos to the preservation of animal biodiversity is very great. Thanks to them, a number of species of rare animals that disappeared in the wild were saved.