This diagram illustrates the changes of various horses foot structure over 40 million years.
First, the Eohippus horse. This typ of this horse exist in this universe at least 40 millin years ego. It had 4 toes in its leg and every toe is nearly same size in skeleton show in diagram.
The Second Mesohippus which horse was from 30 million years ago. This horse is a little bigger than Eohippus and it has 3 toes like Eohippus but there is sligh changes in toe. Middle toe of the Mesohippus is little bigger than the Eohippus.
Third, Merychippus from 15 million years ago. The size of this horse is bigger than the rest I described and the foot is also bigger but the shape of the foot is the same.
Lastly the modern horse from this era. The size of this horse is Bigger and the shape of the foot totally changed. They don’t even have any toe. They have just two hooves.
