A fixed and interval of the same stripe forms are already identified in the embryo during the early pregnancy for females. In the process of embryonic development, as the development of all parts of the body is different, they will form different stripes, some broad and some narrow after the young baby born.
For example, zebra stripes are wider in neck, so the earliest neck striped form must be the seventh week of embryonic development when be prior to determining the neck elongation; the stripes near the nose are very thin, so this part must be formed at the fifth week of embryonic development when determine before the expansion of nose; the strips are widest in hip, indicating the hips and the rest of the body is proportional to the development.
On the other hand, the development of strips can not be earlier than the fifth week of embryonic development, because the zebra has a long striped tail which would not occurred before the fifth week of embryonic development. At this time, the length of embryos is approximately 32 mm, and the number of stripes are about 80, whereby it can be recalculated the initial width of each stripe is about 400 micron, or each stripe has the width about 20 embryonic cells. As to why the stripes on its legs are horizontal, it may be all stripes mechanically turn at an angle during embryonic development of legs.
Zebra stripes on the body are beautiful and elegant which are the major marks for similar to identify one of the more. The more important is a protective color to adapt environment and ensure their survival as an important means of defense. In the widen grassland and desert, such dark brown with white stripes reflect different lights in the sun or moon light, playing the role of vague or disperse the body contours. Therefore, it is difficult to distinguish from the surrounding environment. This protective effect is not easy to expose, on the animal itself is very favorable. In recent years, the study also believes that zebra stripes who can spread and weaken the grasslands spiked fly's attention, is a means to prevent their bites. This insect serves as a vehicle for sleeping sickness transmission, and they often bite horses, antelope and other monochrome animal, but very little threat to the life of zebra.
This protection color is formed under the condition of adaptation to the environment and nature selection gradually. As history had some zebras whose stripes are not obvious, they are easy to expose before natural enemies and killed by them, and finally extinction. This kind of zebras were gradually eliminated in the long the process of biological evolution. Only those stripes distinct and very prominent types can survive to now. Human gained inspiration from this phenomenon that use the stripe principles to maritime operations and paint similar colors on warship, in order to shield the enemy sight and confuse them.
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