Horse Evolution Followed Twisty Trail, Study Says

Horse Evolution Followed Twisty Trail, Study Says (National Geographic: 17-Mar-05)
Writing this week in the journal Science, paleontologist Bruce J. MacFadden said the evolution of horses involved many more twists and turns than previously imagined. Modern steeds did not follow a relatively smooth transition from the diminutive, foxlike forest browsers that were their earliest ancestors to those impressive, open-plains athletes we know today. Rather, horses fluctuated considerably in form and size over time.