Reproductive isolation from a cross between a horse and a donkey or between a mare and a donkey, respectively. These animals are nearly always sterile due to the difference in the number of chromosomes between the two parent species. Both horses and donkeys belong to the genus "Equus", but "Equus caballus" has 64 chromosomes, while "Equus asinus" only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and do not
Hyundai Equus support and a massage system. Hyundai also developed an armoured vehicle based on the limousine, with an enlarged 5.5L version of the V8 engine. On September 2009, Hyundai delivered three bulletproof limousine versions of the luxury sedan Equus to the South Korea Presidential Security Service to be used as the official state car. Hyundai designed this vehicle with a special alloy, with an automatic cooling system in case of fire as well as bulletproof windows. The first-built armoured limousine was donated to Blue House. A modified Hyundai Equus was donated to Costa Rica and is currently used as the presidential