为什么斑马身上有条纹？
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来源：《时代英语·高一》2015年第02期
For many animals， camouflage is an important part of survival. A leopard’s spotted coat and a polar bear’s white fur help them blend into their respective environments. But a zebra’s bold stripes can’t help to disguise it in its natural habitat， the open plains.
The zebra’s bold markings can also help to conceal it. In 1844， naturalist Francis Galton pointed out that stripes can help disguise zebras in the dim， grayish light of an African night. Fifty years later， an artist named Abbot Thayer suggested that stripes could help actually change the way a predator sees a zebra.
The zebra’s bold markings draw the viewer’s attention to the stripes themselves， not the shape of the animal. So when a predator looks at a zebra， it sees stripes first， and then the zebra. This split second of recognition gives the fleet-footed zebra a chance to escape.
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