Horse outward similarity is an unreliable measure of relatedness. Besides the horse, there are six other species of genus "Equus" in the Equidae family. These are the ass or donkey, "Equus asinus"; the mountain zebra, "Equus zebra"; plains zebra, "Equus quagga"; Grévy's zebra, "Equus grevyi"; the kiang, "Equus kiang"; and the onager, "Equus hemionus". Horses can crossbreed with other members of their genus. The most common hybrid is the mule, a cross between a "jack" (male donkey) and a mare. A related hybrid, a hinny, is a cross between a stallion and a jenny (female donkey). Other hybrids include the zorse,
Donkey walk debuted the tradition on Palm Sunday 2014 with the civil and Orthodox leaders of the city in the leading roles. Donkey walk The donkey walk () is a Russian Orthodox Palm Sunday ritual re-enactment of Jesus Christ's entry into Jerusalem. The best known historical donkey walk was practised in Moscow from 1558 until 1693. The Metropolitan and later Patriarch of Moscow, representing Jesus Christ, rode on a "donkey" (actually a horse{insufficient citation}), while the Tsar of Russia humbly led the donkey on foot. From 1561 to 1655 the donkey walk began in the Kremlin and terminated at Trinity Cathedral (now