Perissodactyla is the mammalian group including horses, rhinoceroses and tapirs. Weight-bearing is organized around the central digit of the limb. Its members illustrate substantial body-form diversity within a shared evolutionary lineage.
A horse is an equine mammal within Perissodactyla, with limbs specialized for terrestrial locomotion. Its fossil history supplies unusually rich evidence for changes in diet, tooth wear and crown height. Those changes represent branching lineages rather than one predetermined ladder toward the modern animal.
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