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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