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🦓 Why do zebras have stripes

Investigate the evidence behind zebra stripes, from biting flies and predator vision to social recognition and debated cooling effects.

3
lessons
~10 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. A Pattern with Many HypothesesCompare proposed functions of zebra stripes and explain why visual appeal is not evidence.Zebra patterns vary, and hypotheses about camouflage, cooling, recognition, and insect defense must be tested against predator vision, climate, and behavior.
  2. Flies Meet a Moving TargetExplain how stripe geometry can reduce biting-fly landings and why this hypothesis has strong support.Experiments show that flies approach striped coats but often fail to land, linking narrow high-contrast bands to parasite avoidance.
  3. What the Stripes Do for ZebrasGive a cautious, evidence-weighted answer about the evolutionary function of zebra stripes.Stripes most strongly appear to defend against blood-feeding flies, while social recognition may be useful and camouflage or cooling remain debated.

Questions this course answers

What is the strongest current evidence for why zebra stripes evolved?

Experiments found fewer biting flies landing on striped coats, especially during the close approach.

Why is ordinary camouflage a weaker explanation than it first appears?

Predator-vision studies found that stripes are detectable at relevant distances, so disappearing into the background is not well supported.

Give an evidence-weighted answer to the question of why zebras have stripes.

Scientific explanations are ranked by how well their predictions survive experiments and comparisons.

Grounded in trusted sources

  • Caro et al., Benefits of zebra stripes: Behaviour of tabanid flies around zebras and horses, PLOS ONE (2019) — https://pmc.ncbi.nlm.nih.gov/articles/PMC6382098/
  • How et al., Why don't horseflies land on zebras?, Journal of Experimental Biology (2023) — https://pmc.ncbi.nlm.nih.gov/articles/PMC10088525/
  • Caro et al., Zebra Stripes through the Eyes of Their Predators, Zebras, and Humans, PLOS ONE (2016) — https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0145679
  • Cobb and Cobb, Do zebra stripes influence thermoregulation?, Journal of Natural History (2019) — https://www.tandfonline.com/doi/full/10.1080/00222933.2019.1607600
  • Horvath et al., Experimental evidence that stripes do not cool zebras, Scientific Reports (2018) — https://pmc.ncbi.nlm.nih.gov/articles/PMC6008466/
  • Natural History Museum Los Angeles County, Spotting Species with Zebra Stripes — https://nhm.org/stories/spotting-species-zebra-stripes-mammalogy-collection

Every Wunder lesson is built from real, reputable sources — never invented.

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