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How the Striped Zebra Evolved

Updated on January 22, 2018
Three zebras drinking. Taken on safari in Tanzania.
Three zebras drinking. Taken on safari in Tanzania. | Source

An Old African Legend Explains How Zebras got their Stripes

An old African Legend tells of a young zebra and baboon arguing about getting a drink at a waterhole. A baboon had declared this waterhole his property and guarded it fiercely. Sitting by his fire, the baboon forbade the zebra from drinking and combat ensued. With a mighty kick, the zebra sent the baboon flying. He landed on his seat, creating the bare patch on his rump seen in baboons today. The zebra fell back through the baboon’s fire which scorched him leaving black stripes across his white fur. In shock, he ran to the plains where, with their striped coats, zebras have lived ever since.

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Zebras in the grass, with a termite mound behind them. Taken on safari in Tanzania.Friends can also help scratch that itch!
Source
Zebras in the grass, with a termite mound behind them. Taken on safari in Tanzania.
Zebras in the grass, with a termite mound behind them. Taken on safari in Tanzania. | Source
Friends can also help scratch that itch!
Friends can also help scratch that itch! | Source

Zebra Stripes according to Evolutionary Biology

Although this is a charming explanation for zebra stripes, evolutionary biology tends to work in much more practical ways. Characteristics develop within a species or group because they provide a survival advantage. In the case of zebra stripes, a number of survival advantages seem to have played an evolutionary role:

  1. Cooling mechanism – the alternating color pattern deflects up to 70 percent of the heat hitting the zebra
  2. Identification in the herd – their unique stripes enable zebras to tell each other apart promoting their social behavior of herding
  3. Camouflage – because they travel together in large herds, it is believed the mass of stripes creates the optical illusion of a single large blob intimidating predators. Lions and hyenas believe they are seeing one larger creature; thus, they are less likely to attack.
  4. Reducing parasitism from horseflies – this is the most recent theory regarding the evolutionary pressure of stripe development in zebras.
  • The plains of Africa are also home to many parasites including the blood-sucking horse fly. I have been bitten on our farm several times and can attest to the nasty bite resulting in a section of skin also missing.
  • Horseflies also carry disease and distract the animals from their grazing activities and possibly from detecting predators. The blood-sucking female flies are attracted to linearly polarized light reflected from the hides of grazing animals.
  • Gabor Horvath and his colleagues from Hungary and Sweden have determined that the narrow stripe pattern of zebras reduces light reflection from the zebras’ hides, reducing the number of nasty bites from blood-sucking insects; therefore, reducing disease and distraction from eating and noticing predators.


How much did you learn about the Evolution of Zebra Stripes?

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Factors that caused the Adaptation of Stripes in Zebras to Flourish

Ancient people have always tried to explain events and the world around them according to their level of comprehension at the time. In the last century, humankind's understanding of genetic processes within the cell and within communities of organisms has skyrocketed. Local myths and legends give us a glimpse into the kind of curiosity already present in humans which would gradually lead to all discoveries which would follow. Zebras did not get their stripes by an ancestor who fell into a fire, but humans were curious as to why they had stripes to begin with.

  1. We now understand that environment and experience help to shape genetic expression. As is true of the zebra, a number of environmental influences can shape the expression of a characteristic.
  2. For the zebra the following factors were important in the development of their stripes:
  • the need to conceal themselves from predators,
  • keeping themselves cool in the hot African plains,
  • herd behaviour and
  • reduction of parasitism.

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    • Teresa Coppens profile image
      Author

      Teresa Coppens 6 years ago from Ontario, Canada

      Thanks K9, having a bit of a blue day and you cheered me right up. Glad you enjoyed the hub and accompanying quiz!

    • Teresa Coppens profile image
      Author

      Teresa Coppens 6 years ago from Ontario, Canada

      Happy you enjoyed the article. I was surprised myself at the reasons hypothesized for stripe development. I'll have to look into the zebra-like cousin, that I was not aware of. Thank-you!

    • JKenny profile image

      James Kenny 6 years ago from Birmingham, England

      Hi Teresa, interesting article. I'd always assumed that the stripes had evolved as a defence to confuse predators such as lions, but the theories you present seem more plausible. I remember reading that there was actually a species of horse that lived in North America as recently as 10,000 years ago that had zebra like stripes, could have been a distant cousin?

    • Teresa Coppens profile image
      Author

      Teresa Coppens 6 years ago from Ontario, Canada

      Thank-you Letitia for the feedback. Glad you enjoyed the hub!

    • Teresa Coppens profile image
      Author

      Teresa Coppens 6 years ago from Ontario, Canada

      Scott, I was surprised myself when I read a journal article concerning Zebras and their stripes. All the theories and research do make sense from the point of environmemental factors they would need to adapt to to survive. As for their divergence from horses, you!ve given me something to investigate! Thanks and glad you enjoyed the hub.

    • Teresa Coppens profile image
      Author

      Teresa Coppens 6 years ago from Ontario, Canada

      Thanks Shea! Appreciate the feedback!

    • LetitiaFT profile image

      LetitiaFT 6 years ago from Paris via California

      I'm with Scott, I had stopped at the idea of camouflage. This is all fascinating information. Thanks for compiling it in such a clear and enjoyable manner.

    • scottcgruber profile image

      scottcgruber 6 years ago from USA

      Very interesting topic! I'd always thought the stripes evolved simply as camouflage for hiding in tall grass - the thermal and pest resistance I'd never heard of. Any idea when zebras diverged from the common ancestor with modern-day horses?

    • shea duane profile image

      shea duane 6 years ago from new jersey

      very cool hub.

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