Tim Caro observing zebra behaviour in response to biting fly annoyance
School of Biological Sciences, University of Bristol
Why do zebras have stripes' A study published in PLOS ONE today [Wednesday 20 February] takes us another step closer to answering this puzzling question and to understanding how stripes actually work. The evolution of the zebra's two-tone coat has intrigued scientists for over 150 years. Many theories have been proposed, including avoiding predators, better heat regulation and a social function, yet there is still no agreement between scientists. Now, researchers from the University of Bristol and UC Davis , California, USA, have added evidence to the theory that the primary purpose of zebras' stripes is for avoiding blood-sucking parasites. Professor Tim Caro, Dr Martin How and colleagues have been investigating the behaviours of tabanid horse flies around captive zebras and domestic horses at a livery in North Somerset, using video analysis techniques. Their new study has shown that stripes don't deter horse flies from a distance, with both zebras and domestic horses experiencing the same rate of circling from the flies. However, video analyses revealed differences in approach speed, with horse flies failing to slow down on approach to zebras, which is essential for a successful landing.
TO READ THIS ARTICLE, CREATE YOUR ACCOUNT
And extend your reading, free of charge and with no commitment.
