Donkeys are native to northeast Africa, where they descended from the African wild ass (Equus africanus), a species adapted to the arid scrublands and rocky deserts of what is now Sudan, Eritrea, Ethiopia, and Somalia. Genetic and archaeological evidence places their domestication at roughly 5000 BCE, making them one of the earliest working animals in human history. Their story since then involves a surprising amount of scientific debate, a journey across every inhabited continent, and a wild ancestor that is now among the most endangered mammals on Earth.
The African Wild Ass
The domestic donkey’s wild ancestor, the African wild ass, once ranged widely across the dry grasslands and stony deserts of northern and eastern Africa. Two subspecies are particularly important to the domestication story. The Nubian wild ass (Equus africanus africanus), found in the eastern Sahara and along the Nile Valley, and the Somali wild ass (Equus africanus somaliensis), found further east in the Horn of Africa, both contributed genetic material to the domestic donkeys alive today. Ancient DNA work has confirmed that the Nubian wild ass was the ancestor of at least one major lineage of modern donkeys.1PubMed Central. Ancient DNA from Nubian and Somali wild ass provides insights into donkey ancestry and domestication
These animals were built for harsh, water-scarce landscapes. African wild asses are territorial, with individual males holding enormous home ranges on the order of 200 square kilometers, a scale that reflects how thinly resources are spread across desert terrain.2PubMed. Observations on social organization and behaviour of African and Asiatic wild asses (Equus africanus and E. hemionus) Unlike horses, which tend to form stable bands with lasting social bonds, wild asses live in loose, shifting groups. No permanent bonds form between adult individuals. This fluid social structure is one reason donkeys behave differently from horses in domestic settings: they are less herd-oriented, more independent, and more cautious in unfamiliar situations. People often misread that caution as stubbornness, but it is a survival strategy that served them well in landscapes where a wrong step could mean a fatal fall or an encounter with a predator.
When and Why Domestication Happened
The domestication of donkeys took place in northeast Africa around 5000 BCE, making it roughly contemporary with the domestication of cattle and sheep in the same broad region. A major genomic study analyzing hundreds of ancient and modern donkey samples supports a single geographic origin in Africa, followed by expansions across the continent and into Eurasia.3PubMed. The genomic history and global expansion of domestic donkeys
The timing is not coincidental. Around 5000-6000 years ago, the Sahara was undergoing a dramatic shift from a relatively green, habitable landscape to the hyperarid desert we know today. As grasslands dried up, pastoralist communities that had relied on cattle needed animals better suited to the increasingly harsh conditions. Donkeys, with their ability to cover long distances on minimal water and poor-quality forage, became essential for transporting goods across the expanding desert. Analysis of mitochondrial DNA from donkey populations worldwide suggests that the desertification of the Sahara and the social and trade networks of ancient northeastern African peoples both played roles in driving domestication.4PubMed Central. Potential dual expansion of domesticated donkeys revealed by worldwide analysis on mitochondrial sequences
One Domestication Event or Two?
For years, genetic studies pointed to two distinct mitochondrial DNA lineages in modern donkeys, which many researchers interpreted as evidence that donkeys were domesticated twice, independently, from two different wild populations. The first lineage maps neatly onto the Nubian wild ass, and the second was thought to reflect a separate domestication from the Somali wild ass or another now-extinct population.1PubMed Central. Ancient DNA from Nubian and Somali wild ass provides insights into donkey ancestry and domestication
More recent work, however, has complicated this picture. The large-scale genomic analysis published in Science in 2022 found strong phylogeographic structure in modern donkeys but concluded that the data best support a single domestication in Africa, with the two mitochondrial lineages reflecting diversity within the founding population rather than two separate taming events.3PubMed. The genomic history and global expansion of domestic donkeys The debate is not fully settled, but the trend in the literature has moved toward the single-origin model. Either way, the geographic answer stays the same: donkeys come from Africa, not Asia or Europe.
Why Donkeys Are Not From Asia
This is a common point of confusion, because Asia has its own wild equids that look superficially similar to donkeys. The Asiatic wild ass (Equus hemionus), sometimes called the onager or hemione, lives in the arid steppes and deserts of the Middle East, Central Asia, and the Indian subcontinent. People have occasionally assumed that donkeys might descend from these animals, or at least that Asian populations might have a local wild ancestor.
Genetics rules this out. African wild asses and Asiatic wild asses diverged from a common ancestor roughly 2.3 million years ago, well before any domestication took place.5PubMed. Reassessing the evolutionary history of ass-like equids: insights from patterns of genetic variation in contemporary extant populations They are separate species. A study of Indian donkey populations, for example, found that their mitochondrial DNA clusters cleanly with the Nubian and Somali lineages of the African wild ass and shows no connection at all to the Asiatic wild asses living in the same region.6PubMed. Mitogenomic phylogeny reveals the predominance of the Nubian lineage of African wild ass in Indian donkeys Indian donkeys, like donkeys everywhere, trace their maternal ancestry back to Africa.
The Asiatic wild ass is its own fascinating animal with its own conservation story, and males become territorial in summer in ways that mirror the African wild ass’s spatial behavior.7PLOS ONE. Space-Use Patterns of the Asiatic Wild Ass (Equus hemionus): Complementary Insights from Displacement, Recursion Movement and Habitat Selection Analyses But despite the superficial resemblance, onagers were never successfully domesticated. Ancient civilizations in Mesopotamia tried to use them as draft animals, but the onager proved too aggressive and intractable for reliable work. Donkeys, by contrast, descended from a wild ancestor with a temperament more amenable to working alongside people.
Desert Adaptations That Carried Over Into Domestic Life
Much of what makes donkeys useful to humans traces directly back to their evolutionary origins in arid northeast Africa. Compared to cattle and horses, donkeys have markedly lower energy requirements. They are smaller, spend less energy while foraging, and need less dry matter per day to sustain themselves. On low-quality forage, donkeys digest food almost as efficiently as ruminants like cattle, despite being hindgut fermenters. They are also highly selective feeders: in a given pasture, donkeys tend to pick out higher-quality plants than cattle do, getting more nutrition from the same patch of ground.8PubMed Central. A review of the factors affecting the survival of donkeys in semi-arid regions of sub-Saharan Africa
Their tolerance for thirst is remarkable. Donkeys can go longer without water than cattle, and they are willing to walk further to find it. Lower energy costs of locomotion, combined with longer daily foraging times, let them access remote, underutilized patches of vegetation that cattle simply cannot reach. No single one of these traits is extraordinary on its own, but together they add up to a dramatic survival advantage in drought conditions. This is why donkeys outlast cattle during famines in the Sahel and other semi-arid regions, and it is why ancient pastoralists facing a drying Sahara would have found the African wild ass so valuable to tame.
How Donkeys Spread Around the World
Once domesticated in northeast Africa, donkeys spread first along the trade routes of ancient Egypt and the Near East. Archaeological evidence from the southern Levant shows equids being sorted and managed in the region by the fourth and third millennia BCE, with domestic donkeys becoming established alongside local wild equids like onagers and, eventually, horses.9Persee / Paléorient. Size Matters – Donkeys and Horses in the Prehistory of the Southernmost Levant Donkeys were the primary overland transport animal of the ancient Mediterranean world for centuries before horses became widely available. They carried grain, metals, and trade goods along routes that connected Egypt, Mesopotamia, and the emerging civilizations of the eastern Mediterranean.
From the Near East, donkeys spread into Europe and across Central and South Asia, arriving in China by the second millennium BCE. The Roman Empire used donkeys extensively for agriculture and milling, and distinct regional breeds began to emerge in places like Italy, Spain, and the Iberian Peninsula. After 1492, Spanish and Portuguese colonists brought donkeys to the Americas, where the animals proved indispensable for mining, agriculture, and overland transport in rugged terrain. Genetic analysis of American donkey populations has traced the main colonization pathways back to these 15th-century introductions from the Iberian Peninsula.10PubMed. Genetic relationships among American donkey populations: insights into the process of colonization
Today, donkeys live on every continent except Antarctica. Their global population is estimated at roughly 50 million, with the largest numbers in China, Ethiopia, Pakistan, Egypt, and Mexico. In many parts of the developing world, donkeys remain essential working animals, carrying water, firewood, and agricultural products in places where motorized transport is impractical or unaffordable.
Donkeys in Ancient Egypt
Given that donkeys were domesticated in northeast Africa, it is no surprise that they became culturally embedded in Egypt earlier than almost anywhere else. Donkeys appear in Egyptian tomb scenes as far back as the Old Kingdom, more than four thousand years ago. Their cultural significance went beyond the practical. By the end of the Old Kingdom, the donkey had taken on a complex, ambivalent symbolic role: it could be a helpful creature assisting the sun god Re on his nightly journey through the underworld, or it could be a dangerous force aligned with the chaotic god Seth. Depictions of donkeys and fantastical donkey-hybrid creatures persisted for millennia, appearing in papyri from the Third Intermediate Period and as guardian figures on temple walls during the Greco-Roman period. Ritual scenes showing donkeys being speared or harpooned alongside hippopotami, turtles, and pigs continued as a magical theme well into the Roman era.11Studies in Egyptian Archaeology & Science. Donkeys, Genies & Demons: Fantastic Creatures in Ancient Egyptian Ritual Texts and Funerary Assemblages
This rich symbolic life reflects how deeply woven donkeys were into Egyptian daily existence. They were not just beasts of burden but figures that carried moral and cosmological weight, a level of cultural significance that livestock rarely achieve unless they have been central to a society for a very long time.
The Endangered Ancestor
While domestic donkeys number in the tens of millions, their wild ancestor is in serious trouble. The African wild ass is classified as critically endangered, with only a few hundred individuals believed to survive in the wild, scattered across remote parts of Eritrea, Ethiopia, and possibly Somalia. Habitat loss, competition with domestic livestock for scarce water and grazing, hunting, and interbreeding with feral domestic donkeys have all driven the population to the edge of extinction. The Nubian wild ass subspecies may already be extinct in the wild; the only confirmed surviving wild populations are of the Somali subspecies, recognizable by the horizontal leg stripes that give it a zebra-like appearance.
The irony is stark. The donkey was one of the most successful domestication stories in human history, spreading from a small corner of Africa to every continent and becoming essential to civilizations worldwide. But the wild population from which all of that success came has been reduced to a remnant. Conservation efforts are underway in Eritrea and Ethiopia, but political instability and limited resources in the region make protection difficult. Captive breeding programs exist in a handful of zoos, though genetic diversity in captive populations is a concern.
What Happens When Donkeys Go Feral
In the Americas, Australia, and parts of Africa, domestic donkeys that escaped or were released have established feral populations. These animals have often been viewed as invasive pests, competing with native wildlife for food and water and damaging vegetation. In the American West, land managers have struggled for decades with how to handle growing feral donkey herds on public land.
Recent research, however, has revealed an unexpected ecological role. In the deserts of North America, feral donkeys and horses dig wells up to two meters deep to reach groundwater. These equid-dug wells increase the density of water sources in the landscape, reduce the distance between available water, and at times provide the only accessible water in the area. Vertebrate species richness and activity are higher at these equid wells than at nearby dry sites. The wells also function as nurseries for riparian trees, mimicking the disturbance created by natural flooding. Researchers have suggested that feral equids, including donkeys, may actually buffer water availability in arid ecosystems and increase resilience against the drying effects of climate change.12PubMed. Equids engineer desert water availability
This finding does not resolve the broader debate about feral donkey management, as the animals can still cause real damage in sensitive habitats. But it does complicate the simple narrative that feral donkeys are purely destructive. Their desert-adapted instinct to find water, inherited from African wild ass ancestors that survived some of the driest landscapes on Earth, turns out to benefit other species in their adopted homes.
Heritage Breeds and Genetic Erosion
As donkeys spread around the world over thousands of years, local populations adapted to their environments and to the specific tasks their owners needed them for. This produced a remarkable range of breeds, from the towering Catalonian donkey of Spain to the compact miniature Mediterranean donkey. Some of these breeds became culturally and economically significant in their home regions.
But the 20th century was hard on many donkey breeds. As motorized vehicles and agricultural machinery replaced animal power, demand for working donkeys collapsed in industrialized countries. The Martina Franca donkey of southern Italy, once prized for producing large, strong mules, was at serious risk of extinction by the 1980s as the draft animals it was bred to produce were replaced by tractors.13PubMed. Monitoring of genetic diversity in the endangered Martina Franca donkey population Similar stories played out across Europe and North America, where dozens of local breeds saw their numbers plummet in just a few decades.
Conservation breeding programs have stabilized some of these populations, and there has been a modest revival of interest in donkeys for land management, therapy work, and small-scale agriculture. But the genetic diversity lost during the 20th-century bottleneck cannot easily be recovered. Ironically, donkeys in developing countries, where they are still heavily relied upon for daily work, maintain far greater genetic diversity than the carefully pedigreed populations in Europe, precisely because those working populations are large and loosely managed rather than bred to narrow standards.
The Donkey Voice
Anyone who has heard a donkey bray knows it is one of the most distinctive sounds in the animal world. Recent research into equid vocalizations has revealed something interesting about why donkeys sound the way they do. While horses and Przewalski’s horses produce whinnies with two simultaneous fundamental frequencies generated by independent mechanisms in the larynx, donkeys produce calls with only a single fundamental frequency.14Cell Press (Current Biology). Dual fundamental frequencies in horse whinnies are produced by independent laryngeal mechanisms The donkey’s bray, that unmistakable alternation between an inhaled “hee” and an exhaled “haw,” carries remarkably well across open terrain, which makes sense for an animal that evolved in vast, sparsely populated desert landscapes where group members might be kilometers apart. A horse’s whinny is effective for communication within a relatively close social band. A donkey’s bray is built to reach distant ears across flat, open ground, one more trait shaped by the arid African homeland where the species first took shape.