14 Zany Facts About Zebras

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Getty Images

Zebras are more than just striped members of the horse family. Some are rugged mountaineers, some have spots instead of stripes, and some of them bark like dogs. Read on to discover these and other bizarre facts about zebras. 

1. A ZEBRA’S COAT IS A GIANT BAR CODE—AND WE CAN SCAN IT.

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Every zebra has a unique pattern of stripes. And scientists can use the patterns like bar codes to identify individuals in a herd and keep track of them over time.

Compared to today’s methods, the first efforts to identify zebras by their stripes were pretty low-tech. Hans and Ute Klingel, a husband and wife team, pioneered stripe recognition with Grevy’s zebras back in the 1960s. First, they photographed a bunch of zebras. Then they developed the pictures in a dark room they erected right in the field. Next, they created a card index with coded, hand-written notes on each animal’s pattern. See a few of their cards here.

These days, special software can scan images of zebras and identify individuals by “reading” their stripes like bar codes. It can even compensate for changes in posture and weight, including pregnancy. 

2. ZEBRA STRIPES MAY SERVE AS BUG SPRAY OR AIR CONDITIONING. 

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For decades and decades, scientists have wondered why zebras have stripes. One prevailing theory held that the stripes confused predators, making it harder for, say, a lion to pick out an individual zebra from a stampeding herd. 

Lately, more intriguing theories have emerged. Some scientists think that stripes keep zebras cooler. The dark stripes soak up more sunlight than the light ones, and this stirs up eddies of wind that swirl heat away. Other researchers discovered that biting flies avoid striped patterns. And the two theories might be linked: Biting flies prefer hot temperatures, so they may be less likely to bite a cooler zebra. 

3. BUT ZEBRAS DON’T ALWAYS HAVE BLACK AND WHITE STRIPES. 

Yathin S Krishnappavia Wikimedia // CC BY-SA 3.0

There are three species of zebra, and many subspecies. They come in different sizes, body shapes, stripe patterns—and, to a certain extent, even colors. The white stripes can verge on cream and the dark stripes can be black or brown. Some subspecies have pale, shadowy stripes between the larger dark ones. Plus, there are all sorts of mutations and variations. The occasional zebra has spots and some are so pale they're almost entirely white

4. MOUNTAIN ZEBRAS ARE RUGGED.

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One of the three zebra species, the mountain zebra, lives mostly in hilly, rocky places in South Africa and nearby Namibia. It has especially hard, sharp hooves that help it climb and keep its balance in rugged terrain. And while this rugged critter can’t grow a mountain man beard, it does have a bizarre, prominent neck flap called a dewlap.

5. PLAINS ZEBRAS ARE SMALL AND NUMEROUS. 

Walter Voigts via Wikimedia // CC BY-SA 3.0

Plains zebras are the smallest. They’re also the most abundant—in fact, they’re the most numerous of all the wild members of the horse family. They roam across much of southeastern Africa. 

Plains zebras come in all sorts of subspecies, and there’s a lot of coat variation between. For example, as you travel farther south across Africa, plains zebras will have fewer stripes on their legs. Nobody’s sure why, but it may have something to do with temperature or populations of those biting flies. 

6. GREVY’S ZEBRAS ARE LARGE AND PRESIDENTIAL. 

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Found in Kenya and Ethiopia, Grevy’s zebras have a more donkey-like shape, with huge round ears. They’re the largest wild members of the horse family, and can weigh up to 990 lbs. (Yes, domestic horses get much bigger, but that’s because we’ve spent thousands of years breeding them into all sorts of shapes and sizes; some are enormous.) 

These zebras are named after a President of France. In 1882, Emperor of Abyssinia (now Ethiopia) Menelik II presented one as a gift to French President Jules Grévy. Ever since then, they’ve been named in honor of Grévy.

7. TO TELL THEM APART, LOOK AT THE BUTT.

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There are plenty of useful field marks for distinguishing the zebra species, but one is to look at the pattern on the rump. Mountain zebras have a “gridiron” pattern of small stripes above their tail. Plains zebras have broad bands across the rear. Grevy’s zebras have a sort of triangle pattern on the rump, with lots of small lines near the tail. Once you learn these differences, you’ll tell them apart with ease—just be sure to explain to your safari companions why you’re so fascinated by zebra butts. 

8. ONE EXTINCT ZEBRA HAD A STRIPE-FREE BUTT. 

A quagga at the London Zoo in 1870. Image credit: Frederick York via Wikimedia // Public Domain

The quagga, a remarkable subspecies of the plains zebra, was mostly yellow-brown and un-striped below its shoulders. Native to South Africa, it was driven to extinction by European settlers and hunters. The last quagga died at the Amsterdam Zoo in 1883.

Incredibly, a group called the Quagga Project, based in South Africa, has been working to resurrect this subspecies. They pick plains zebras that look the most quagga-like and breed them together, hoping to awaken any quagga genes that may still be present. The project has drawn criticism, however: some argue that recreating an animal’s appearance isn’t the same as restoring its unique behavior and ecological role.

9. ZEBRA ROMANCE ISN’T EASY.

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Mountain zebras and plains zebras live in small groups consisting of one stallion (male) and a handful of mares (females). You may notice that this ratio is a little askew. Where do the “extra” males go? Stallions that haven’t secured a herd will gather to bro down in roving bachelor bands. Some of those bachelors may try to take over a pre-existing herd, but it's no easy task. First, a bachelor must defeat the lead stallion. Then, he waits for the females to warm up to him—which may take up to three years.

And then there’s the Grevy’s zebra. A mature Grevy’s stallion doesn’t seek to command a herd of females—he stakes out some land. Ideally, he claims a territory that has some nice food and water. Then he hunkers down and plays the waiting game. Female Grevy’s zebras are wanderers, and the stallion is hoping that the ladies will visit for some sustenance and perhaps romance. Young Grevy’s males who don’t have territories will buddy up into groups and also wander. Those territorial stallions tolerate their presence—that is, until a receptive female wanders by. Then things get ugly. (Don't click on that link unless you're comfortable with graphic zebra romance.)

10. DON’T RIDE A ZEBRA. 

No, really: don’t. Humans domesticated horses thousands of years ago, modifying their appearance and behavior and turning them into compliant, beloved companions. But zebras were never domesticated. It’s sort of like the difference between a poodle and a wolf. There are several reasons that humans domesticated horses instead of zebras, including a zebra’s ducking reflex. Watch this video to learn more.

11. ZEBRAS NEIGH, BRAY, AND … BARK.

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Zebras make all sorts of weird sounds. Mountain zebras whinny like a horse, Grevy’s zebras bray like a donkey, and plains zebras bark like dogs. Alarmed stallions may squeal or snort, and happy zebras may push air between their lips when they’re eating. 

12. ZEBRAS CAN MAKE ZORSES, ZONIES, ZEDONKS, AND MORE. 

A zedonk, or hybrid zebra-donkey. Image credit: Getty Images

Zebras can breed with other members of the horse family. The offspring come in an amazing variety of semi-striped patterns, and are usually sterile (meaning they can’t have young). Zorses are the offspring of horse stallions and zebra mares. Zedonks are the products of zebra stallions and donkey mares. Zonies come from zebras and ponies. And there are many more bizarre possibilities

13. ZEBRAS ARE IN TROUBLE.

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Two out of the three zebra species aren’t doing so well. Grevy’s zebras are in the deepest doo-doo: habitat loss, hunting, competition for food and water with domestic grazing animals, and disease have all taken their toll. The International Union for Conservation of Nature (IUCN) labels them endangered and says they’ve “undergone one of the most substantial reductions of range of any African mammal.” There are only about 2000 of these big-eared zebras left.

Mountain zebras face similar threats, and are listed as Vulnerable, which is one rung better than Endangered. There are about 9000 left. 

Plains zebras, on the other hand, are in pretty okay shape. Despite local declines from habitat loss and hunting, their population is fairly stable

Preserving zebras is important because they’re amazing, and because they’re food for majestic predators like lions. But also… 

14. PLAINS ZEBRAS MAKE GRASSLANDS TASTIER.

For pickier grazers such as Thomson’s gazelles and wildebeest, zebras are a huge boon. Those striped heroes have special digestive systems that can quickly process lower-quality forage. Plains zebras are often the first to enter an un-grazed grassy area. They’ll munch on older, harder, less nutritious plants that other grazers can’t eat. Once the old stuff is cleared out, tender new growth pops up. More selective grazers will then wander in and eat the good stuff.

This Wall Chart Shows Almost 130 Species of Shark—All Drawn to Scale

Pop Chart Lab
Pop Chart Lab

Shark Week may be over, but who says you can’t celebrate sharp-toothed predators year-round? Pop Chart Lab has released a new wall print featuring nearly 130 species of selachimorpha, a taxonomic superorder of fish that includes all sharks.

The shark chart
Pop Chart Lab

Called “The Spectacular Survey of Sharks,” the chart lists each shark by its family classification, order, and superorder. An evolutionary timeline is also included in the top corner to provide some context for how many millions of years old some of these creatures are. The sharks are drawn to scale, from the large but friendly whale shark down to the little ninja lanternsharka species that lives in the deep ocean, glows in the dark, and wasn’t discovered until 2015.

You’ll find the popular great white, of course, as well as rare and elusive species like the megamouth, which has been spotted fewer than 100 times. This is just a sampling, though. According to World Atlas, there are more than 440 known species of shark—plus some that probably haven't been discovered yet.

The wall chart, priced at $29 for an 18” x 24” print, can be pre-ordered on Pop Chart Lab’s website. Shipping begins on August 27.

Can You Really Suck the Poison Out of a Snakebite?

iStock
iStock

Should you find yourself in a snake-infested area and unlucky enough to get bitten, what’s the best course of action? You might have been taught the old cowboy trick of applying a tourniquet and using a blade to cut the bite wound in order to suck out the poison. It certainly looks dramatic, but does it really work? According to the World Health Organization, approximately 5.4 million people are bitten by snakes each year worldwide, about 81,000 to 138,000 of which are fatal. That’s a lot of deaths that could have been prevented if the remedy were really that simple.

Unfortunately the "cut and suck" method was discredited a few decades ago, when research proved it to be counterproductive. Venom spreads through the victim’s system so quickly, there’s no hope of sucking out a sufficient volume to make any difference. Cutting and sucking the wound only serves to increase the risk of infection and can cause further tissue damage. A tourniquet is also dangerous, as it cuts off the blood flow and leaves the venom concentrated in one area of the body. In worst-case scenarios, it could cost someone a limb.

Nowadays, it's recommended not to touch the wound and seek immediate medical assistance, while trying to remain calm (easier said than done). The Mayo Clinic suggests that the victim remove any tight clothing in the event they start to swell, and to avoid any caffeine or alcohol, which can increase your heart rate, and don't take any drugs or pain relievers. It's also smart to remember what the snake looks like so you can describe it once you receive the proper medical attention.

Venomous species tend to have cat-like elliptical pupils, while non-venomous snakes have round pupils. Another clue is the shape of the bite wound. Venomous snakes generally leave two deep puncture wounds, whereas non-venomous varieties tend to leave a horseshoe-shaped ring of shallow puncture marks. To be on the safe side, do a little research before you go out into the wilderness to see if there are any snake species you should be particularly cautious of in the area.

It’s also worth noting that up to 25 percent of bites from venomous snakes are actually "dry" bites, meaning they contain no venom at all. This is because snakes can control how much venom they release with each bite, so if you look too big to eat, they may well decide not to waste their precious load on you and save it for their next meal instead.

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