In the wild, a Przewalski's horse herd would be made up of a stallion, a few mares and young horses. Mating occurs in April or May and a single foal is born almost a year later. The foal is usually born during the night and by the morning it is strong enough to travel with the herd. If a foal lags behind, particularly if the herd is fleeing from danger, the stallion grasps the root of the foal's tail and encourages it along.
The foal is capable of grazing within a few weeks but the mare suckles it for several months, perhaps until she gives birth again. A female foal (a filly) may remain with the herd for some time. The stallion drives young males out after a year and they group up in small herds until they are about three years old, strong and mature enough to collect a harem of mares.Read More: Przewalski's Horse and Humans