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A horses legs have changed over time to accommodate a new type of environment and lifestyle for the horse. The first horses began as a fox sized browser that ate leaves and lived in a forest where multiple toes was an advantage for a prey animal. As the environment changed and gave way to grasslands the horse began to loose it's extra toes and become a grazer. It's legs lengthened to provided better speed and height in the tall grasses and a single toe was all they needed to survive.

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Q: Why have horses legs changed over time?
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