The cross on a donkey’s back is a natural dorsal stripe and shoulder stripe. A Christian legend says it marks the donkey that carried Jesus.
Natural markings
Donkeys have a dark dorsal stripe and a shoulder stripe, forming a cross. It is genetic, from wild ancestors.
Legend
Christian tradition says the cross was given to the donkey that carried Jesus into Jerusalem on Palm Sunday.
Science
Wild asses and zebras have similar stripes.
Variation
Some donkeys lack a cross.
Note
The legend isn’t scientific.
The marking and its genetics
Donkeys often have a dark stripe along the back and another over the shoulders, forming a cross. This “dorsal stripe” and “shoulder stripe” are common in wild asses and many domestic donkeys, and they are inherited traits tied to coat color genes. Not all donkeys have them, and some varieties are plain colored.
- Wild African asses (Equus africanus) have these primitive markings as part of their ancestral coat pattern.
- Dun factor in horses and some donkeys gives dorsal stripes and shoulder stripes.
- Domestic donkeys originated in Africa about 5,000 to 7,000 years ago.
Legend
Christian folk tradition says the cross marks donkeys because a donkey carried Jesus into Jerusalem on Palm Sunday, with the cross left as a sign of honor. This is a legend and not a scientific explanation. Other cultures have different stories. Biologists explain the pattern through genetics and camouflage. The Gospel accounts mention a colt or donkey but say nothing about its coloring.
The marking and its genetics
Many donkeys carry a dark stripe along the back crossed by another over the shoulders, known as the shoulder cross. It is a hereditary trait present in most wild asses, such as the African wild ass, and is inherited in domestic donkeys. The stripe is a dorsal stripe and the shoulder stripe, made of darker pigment.
Legend
Christian tradition links the cross to Jesus riding a donkey into Jerusalem on Palm Sunday, recorded in the Gospels, and says the donkey was marked as a blessing. This is a folk legend, not a biological explanation. Donkeys have been domesticated for about 5,000 to 6,000 years, beginning in northeast Africa.
Genetics of the dorsal stripe
The dorsal stripe and shoulder stripe in donkeys are linked to a primitive wild type coat pattern and the dun gene. Pigmentation genes such as MC1R and Agouti influence color. Nearly all donkeys, even white or spotted ones, may carry the stripe in some form. Horses and mules can show it too; mules often inherit it from their donkey sires.
Origins and cultural lore
Domesticated about 5,000 to 7,000 years ago from the Nubian wild ass in northeastern Africa, donkeys carry loads and plow. A legend tells that the cross appeared after Jesus rode a donkey into Jerusalem, which is why donkeys are associated with Palm Sunday. There are about 50 million donkeys worldwide, according to the Donkey Sanctuary.
Based on data from the Donkey Sanctuary and Encyclopaedia Britannica
