Evolution Over Time


Changes and Transitions in Size and Structure



Shown here is the change of the horse's size; the pictures are drawn to scale.

Eohippus (12") > Mesohippus (20") > Merychippus (40") > Pliohippus (47") > Equus (62")  



This is the change in skeletal structure (not shown to scale).

Eohippus > Mesohippus > Merychippus > Pliohippus > Equus



This shows the change in hoof structure.

Eohippus > Mesohippus > Merychippus > Equus


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