In the second half of the Miocene temperatures dropped, and grasslands began to expand. After the mid-Miocene climate change there grew vast grasslands in place of the forests which were there before. The browsers had teeth and behaviours which suited forests, and they largely died out. The modern herbivores are almost entirely grazers which "mow the lawns" of the huge African grasslands. This can be seen by comparing their teeth with the teeth of species from the earlier part of the Miocene. The same is true of the Americas and Asia. The world was drier, and grasslands spread. Browsers became extinct, and grazers took over.
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