Each zebra has its own unique pattern of distinctive stripes (带), just ____humans have their own unique pattern of fingerprints, Zebras stick together in herds (兽群). Within a herd, zebras tend ____ (stay) together in smaller family groups. Families are generally made up of a male, several females____their young.

    As zebras graze, they use their sharper front teeth to bite the grass, and then use their duller back teeth to crush and grind. A zebra's teeth keep growing for____ (it) entire life, because constant chewing____(wear) them down.

    Zebras are____ (constant) on the move to find fresh grass and water. Sometimes they gather in huge herds of thousands as they migrate to better feeding____ (area). They often travel in____ (mix) herds with other grazers and browsers, such as wildebeest.

    Zebras groom (理毛) one another, If you see two zebras standing close____ each other and it looks like they're biting each other, don't worry. They're pulling loose hairs off each other as they groom. Grooming also feels good to a zebra—it's like having an itch scratched,

    While most zebras are least endangered, Grevy's Zebra____ (classify) as endangered.