The last of the truly wild horses, Przewalski's Horse became extinct in the wild in 1969. Every living horse is descended from 9 of the 13 animals in captivity in 1945. With careful selective, captive breeding, combining and crossing bloodlines from stock scattered in zoos across the world, this captive population was increased, and the population now numbers over 1,500. From the 1990s onwards, small herds have been released into the wild. Herds consist mostly of females and their foals, led by a dominant male. Once the juveniles reach maturity, they leave their natal herd. Lone and old stallions sometimes form bachelor herds.
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