In September 2019 a zebra foal covered in white polka dots instead of stripes was seen in Kenya's Maasai Mara National Reserve. Maasai guide Antony Tira spotted him first, and the foal was named Tira after him. Biologists who looked at the photographs said the unusual coat was most likely caused by pseudomelanism, a rare genetic condition that disrupts the way pigment forms stripes. The foal was thought to be only about a week old when the first pictures were taken.
The images spread around the world within days. National Geographic credited photographs to Frank Liu, who was on safari with Tira; the guide also photographed the foal and posted the pictures on his camp's Facebook page, and some reports also named photographer Rahul Sachdev. Picture agencies distributed further shots and a video. Similar dotted foals had been recorded before in Botswana's Okavango Delta, but this was reported as the first sighting of its kind in the Mara. Below, each photo is paired with what it shows and what scientists can, and cannot, say about it.
Tira beside his mother, and on his own. Next to her crisp black-and-white stripes, his coat looks almost like a different species: a dark brown body scattered with white dots, which run into short broken stripes on the legs.
Tira in the photographs
Walking through long grass, Tira shows the classic signs of a very young foal: long, wobbly-looking legs, a short fuzzy mane and a soft brown tone. Normal zebra foals are also born with brownish stripes that darken over the first months, so part of his brown colour is simply his age.
Tira trotting after his mother across short grass. A newborn zebra will follow almost anything that moves, so in the first days a mare keeps other zebras at a distance while her foal learns her stripe pattern, smell and voice.
Side view of the foal on his own. The white dots line up in rows that follow the curves where stripes would normally run, which is one clue that the stripe "plan" is still there even though the pigment did not fill it in properly.
Tira nursing. Zebra foals start nibbling grass after a few weeks but are usually weaned only at around eleven months, so milk remained his main food during the period these pictures cover.
Mother and foal standing together. The contrast makes it easy to see that his legs carry more stripe-like marks than his body, a pattern also seen in other zebras with unusual coats.
A close portrait of the foal facing right. The dark muzzle, the dotted neck and the striped lower legs give a good view of how the abnormality varies over different parts of the body.
The video
This short clip was distributed by the British agency Caters News, which also supplied several of the still photographs. Seeing the foal move makes it easier to judge how the dots and leg stripes look from different angles, something single photos can flatten.
What causes the spots
Zebras have black skin. Under the coat, the skin is dark all over, and if you could shave a zebra it would look almost uniformly black. The stripes come from the hair. Pigment cells called melanocytes, which make the dark pigment melanin, are spread across the skin, and during development they are switched on or off in a pattern so that some hairs turn dark and others stay pale.
In pseudomelanism, the melanocytes are present but the melanin is not laid down in the normal stripes. UCLA biologist Ren Larison, who studies zebra coats, described the condition to National Geographic, and geneticist Greg Barsh suggested that Tira's pigment cells were working but failing to organise into stripes. The result is a mostly dark coat with pale gaps, the reverse of what we usually see.
Some early posts said the foal had melanism, the opposite of albinism. That label is not quite right. True melanism means an excess of dark pigment; in Tira's case the issue is the pattern, not the amount. Abnormal zebra coats come in several forms, including dark animals with white legs, broken or spotted stripes, and pale "blonde" zebras with partial albinism, one of which was reported in Tanzania's Serengeti earlier in 2019.
Black with white stripes, or white with black?
The old riddle does not have a neat answer. The skin is black, which supports "black with white stripes". But the unstriped belly and inner legs of most zebras are pale, and the dark stripes are where pigment has been added to the hair, which supports the other view. Most biologists treat it as a matter of wording: the animal is dark-skinned with a coat of dark and pale stripes.
Why zebras have stripes at all is a more interesting question. Ideas include camouflage, confusing predators, keeping cool and helping zebras recognise each other. The best-supported explanation today is protection from biting flies. In experiments with captive horses and zebras, flies approached striped coats but often failed to land on them, and these flies can carry diseases that are dangerous to zebras.
What happened next
Experts were cautious about Tira's prospects. Larison told National Geographic that zebras with unusual colouring probably do not survive as long, because a foal that stands out from the herd may be easier for predators to pick out. Tim Caro of UC Davis, who has studied stripes and flies for years, suggested Tira might be less protected from biting flies. A local wildlife specialist, Parmale Lemein, was reported in the Kenyan press as saying that similar foals rarely live beyond six months, though no study was cited for that figure and it should not be read as a fixed prediction.
There was also some good news. Research from South Africa found that zebras with unusual coats were accepted by their herds and formed normal bonds, including mating. About a month after the first sighting, Kenya's Daily Nation reported that Tira had crossed with the migrating herds into Tanzania's northern Serengeti and was grazing with them; his fate after that was not widely reported.
For visitors, these sightings are a reminder of why guides and photographers matter to conservation: careful records of unusual animals help scientists understand how coat patterns form and how healthy a population is. If you are lucky enough to see one, keep your distance and let the herd behave naturally.
Sources: National Geographic: Rare polka-dotted zebra foal photographed in Kenya (2019) · Smithsonian Magazine: Spotted in Kenya (2019) · Wikipedia: Zebra · Daily Nation (Kenya) · Daily Nation: Polka-dotted zebra leaves the Mara for Tanzania · Wikipedia: Plains zebra · Image credits: Maasai Mara Wildlife Conservancies Association, Caters News, Caters Clips
Explore a related story: Tim Flach's Endangered: Portraits That Invite Closer Attention.
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