The wildebeests follow, in their migration, the pattern of local rainfall.
2
后来的物种都依赖于早期物种的准备工作,因为斑马的行动改变了植被,以适应角马、黄羊和瞪羚的胃。
The later species all depend on the preparations of the earlier one, for the actions of the zebra alter the vegetation to suit the stomachs of the wildebeest, topi, and gazelle.
The other three species differ in the proportion of lower leaves and higher stems that they eat: zebras eat the most stem matter, wildebeests eat the most leaves, and topi are intermediate.