Why don't tigers eat zebra when they see it?

Most zebras are collective activities, and tigers dare not provoke zebras easily because the stripes on zebras form huge textures, which will cause visual errors or visual interference to wild animals such as tigers and lions during their actions, so that these wild animals dare not approach zebras easily to avoid being accidentally injured.

There is also a joke about zebra tiger:

One day, the tiger saw a zebra walking. The tiger said to the zebra, I want to eat you. The zebra replied, why do you want to eat me? The tiger said, I have a cold. The doctor told me to eat black for free. Sweating. .