Brooklyn College
City University of New York
Lab #3: Horses Page1

Modern horses (Equus equus) and their close relatives (zebra, and wild asses) evolved over about 60 million years from small forest-dwelling precursors. Several thousand years of controlled breeding have produced a wide array of modern types, including horses built for speed, such as the Arabian horse (upper left) and quarter horse (lower center), and for strength, such as the Scottish Clydesdale horse (lower right). American mustangs (top center and right), which derived from horses escaped from the early Spanish Conquistadores, became the basis of wealth among native Americans of the Great Plains and Rocky Mountains.