Most of us have grown up hearing about them: the mule in the Nativity scene, Donkey from Shrek, or the donkey in children’s songs. But if we were asked to distinguish between the terms burro, asno, and mula, would we really know the differences? Many people confuse these words or assume they describe the same animal. In this article, we’ll clarify the distinctions between donkeys, asses, and mules.
The answer is no.
Both “donkey” (burro) and “ass” (asno) refer to the same animal: the African wild ass (Equus africanus), whose domesticated form is often written as E. africanus asinus.
The word burro comes from the Latin burricus (“small horse”) and is more colloquial, while asno comes from asinus and is closer to the scientific term. In English, both are simply called donkeys.
Main features (compared to horses or zebras):
Smaller body size (though it varies by breed).
Short, upright mane instead of a long flowing one.
Long ears, which help dissipate heat.
Longer lifespan than horses, living up to 35–40 years.
Common coat colors: gray, brown, black, or white. Lighter markings are often found around the muzzle, eyes, and belly, and most donkeys show a darker “cross-shaped” stripe across their back and shoulders.
Types: Wild donkeys and domestic donkeys. Domestic donkeys are hardy, cost-effective, and valued for transport, riding, and farm work thanks to their stamina and ability to thrive on poor-quality feed.
The term mule often causes confusion alongside “donkey” and “ass.” Unlike those two—which are the same animal—the mule is a hybrid.
It is the offspring of a male donkey (jack) and a female horse (mare).
Mules belong to the same family (Equidae) as horses and donkeys, but they are sterile because the parent species have different chromosome counts (horses: 64, donkeys: 62). The hybrid offspring end up with 63 chromosomes, making reproduction virtually impossible.
Why hybrids are sterile (simple explanation):
For reproduction to succeed, chromosomes must pair correctly. Horses and donkeys don’t have the same chromosome number, so the pairing fails, and viable sperm or eggs cannot form.
Mule characteristics:
From the donkey: large head, long ears, short mane.
From the horse: height, body shape, uniform coat, neck and rump proportions, and teeth structure.
Strong and resilient, with remarkable endurance, making them excellent work animals.
Sure-footed, ideal for mountainous terrain and heavy loads.
Vocalization: A mix between the donkey’s bray and the horse’s neigh.
Main drawback: Infertility.
The hinny is another donkey–horse hybrid, but it is the reverse cross:
The offspring of a male horse (stallion) and a female donkey (jenny).
Hinnies are rarer than mules because female donkeys are smaller than mares, which complicates pregnancy and delivery.
Hinny features (vs. mules):
Generally smaller than mules.
Shorter ears (though still longer than a horse’s).
Longer, slimmer head.
Body heavier in proportion to the legs, giving a different overall appearance.
Like mules, almost always sterile.
Animal | Origin | Fertility | Size & Build | Distinctive Traits | Lifespan |
---|---|---|---|---|---|
Donkey (ass) | Same species (Equus africanus) | Fertile | Smaller than horse | Long ears, short mane, “cross” marking on back, lighter muzzle/eye/belly | Up to 40 years |
Mule | Male donkey × female horse | Sterile | Taller, body shape like horse, head & ears like donkey | Strong, hardy, sure-footed; bray + neigh sounds | Similar to horse |
Hinny | Male horse × female donkey | Sterile | Smaller than mule, heavy body vs. legs | Shorter ears than mule, slim long head | Similar to mule |
Even though they cannot reproduce, mules (and occasionally hinnies) have been prized for centuries because:
They combine the endurance and toughness of donkeys with the strength and size of horses.
They require less food than horses for similar workloads.
They are more resistant to disease and better adapted to harsh environments.
They are ideal for farm work, transport, and mountainous regions.
Donkey = Ass. Two words, one animal (Equus africanus).
Mule = male donkey × female horse. Strong, useful, sterile.
Hinny = male horse × female donkey. Smaller, rarer, also sterile.
Together, these animals have been indispensable throughout human history for farming, travel, and transport.
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