A Single Mutation Made It Easier to Ride Horses

Horses normally move about in one of three ways: they walk, trot or gallop. The middle gait, the trot, is a horse’s Goldilocks stride — not so fast that it gets tired, but not so slow that it gets left in the dust.

Unfortunately for the humans that like to ride on horses’ backs, the trot is a pretty uncomfortable gait. During a trot, a horse will lift two legs at a time in diagonal pairs, alternating sets as it goes. This is a very economical motion for the horse, as it requires little ex

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