By the late Miocene Epoch, the Merychippusline had undergone 'explosive radiation' and
quickly produced several new branches of the horse evolutionary tree. One of these led to
the genus Equus, which includes the modern horse, Equuscaballus, as well as zebras and
asses. About 1 million years ago there were more than 20 Equusspecies on almost every
continent, except Australia and Antarctica, but many went extinct. The modern horse
carries all its weight on only one large hoof-capped toe per foot, with small 'splints'
representingthe toes to either side.
By the late Miocene Epoch, the Merychippusline had undergone 'explosive radiation' and quickly produced several new branches of the horse evolutionary tree. One of these led to the genus Equus, which includes the modern horse, Equuscaballus, as well as zebras and asses. About 1 million years ago there were more than 20 Equusspecies on almost every continent, except Australia and Antarctica, but many went extinct. The modern horse carries all its weight on only one large hoof-capped toe per foot, with small 'splints' representingthe toes to either side.
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