Experimental evidence that stripes do not cool zebras

Research output: Contribution to journalArticle

Abstract

There are as many as 18 theories for the possible functions of the stripes of zebras, one of which is to cool the animal. We performed field experiments and thermographic measurements to investigate whether thermoregulation might work for zebra-striped bodies. A zebra body was modelled by water-filled metal barrels covered with horse, cattle and zebra hides and with various black, white, grey and striped patterns. The barrels were installed in the open air for four months while their core temperature was measured continuously. Using thermography, the temperature distributions of the barrel surfaces were compared to those of living zebras. The sunlit zebra-striped barrels reproduced well the surface temperature characteristics of sunlit zebras. We found that there were no significant core temperature differences between the striped and grey barrels, even on many hot days, independent of the air temperature and wind speed. The average core temperature of the barrels increased as follows: White cattle, grey cattle, real zebra, artificial zebra, grey horse, black cattle. Consequently, we demonstrate that zebra-striped coats do not keep the body cooler than grey coats challenging the hypothesis of a thermoregulatory role of zebra stripes.

Details

Authors
  • Gábor Horváth
  • Ádám Pereszlényi
  • Dénes Száz
  • András Barta
  • Imre M. Jánosi
  • Balázs Gerics
  • Susanne Åkesson
Organisations
External organisations
  • Eötvös Loránd University
  • Hungarian Natural History Museum
  • University of Veterinary Medicine, Budapest
  • Estrato Research and Development Ltd
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Evolutionary Biology
Original languageEnglish
Article number9351
JournalScientific Reports
Volume8
Issue number1
StatePublished - 2018 Dec 1
Publication categoryResearch
Peer-reviewedYes