Evolution of the horse | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-10

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Evolution_of_the_horse


00:02:08 1 History of research
00:07:47 2 Before odd-toed ungulates
00:07:58 2.1 Phenacodontidae
00:08:42 3 Eocene and Oligocene: early equids
00:08:54 3.1 iEohippus/i
00:11:29 3.2 iOrohippus/i
00:12:45 3.3 iEpihippus/i
00:13:33 3.4 iMesohippus/i
00:16:03 3.5 iMiohippus/i
00:17:21 4 Miocene and Pliocene: true equines
00:17:32 4.1 iKalobatippus/i
00:18:21 4.2 iParahippus/i
00:19:09 4.3 iMerychippus/i
00:19:46 4.4 iHipparion/i
00:21:06 4.5 iPliohippus/i
00:22:12 4.6 iDinohippus/i
00:22:37 4.7 iPlesippus/i
00:23:46 5 Modern horses
00:23:56 5.1 iEquus/i
00:29:33 5.2 Genome sequencing
00:30:48 5.3 Pleistocene extinctions
00:32:56 5.4 Return to the Americas
00:34:17 6 Details
00:34:26 6.1 Toes
00:35:08 6.2 Teeth
00:36:08 6.3 Coat color
00:36:42 7 See also



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SUMMARY
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The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse. Paleozoologists have been able to piece together a more complete outline of the evolutionary lineage of the modern horse than of any other animal. Much of this evolution took place in North America, where horses originated but became extinct about 10,000 years ago.The horse belongs to the order Perissodactyla (odd-toed ungulates), the members of which all share hooved feet and an odd number of toes on each foot, as well as mobile upper lips and a similar tooth structure. This means that horses share a common ancestry with tapirs and rhinoceroses. The perissodactyls arose in the late Paleocene, less than 10 million years after the Cretaceous–Paleogene extinction event. This group of animals appears to have been originally specialized for life in tropical forests, but whereas tapirs and, to some extent, rhinoceroses, retained their jungle specializations, modern horses are adapted to life on drier land, in the much harsher climatic conditions of the steppes. Other species of Equus are adapted to a variety of intermediate conditions.
The early ancestors of the modern horse walked on several spread-out toes, an accommodation to life spent walking on the soft, moist grounds of primeval forests. As grass species began to appear and flourish, the equids' diets shifted from foliage to grasses, leading to larger and more durable teeth. At the same time, as the steppes began to appear, the horse's predecessors needed to be capable of greater speeds to outrun predators. This was attained through the lengthening of limbs and the lifting of some toes from the ground in such a way that the weight of the body was gradually placed on one of the longest toes, the third.