Agree: not surprising..I don't know, maybe cos they are designed to be digesting something 18-20 hours a day?....
side note: We have figured out how to compensate (hard feeds/grain) for the amount of graze time we fill with work but not the physiolgical effects. We have also created greater ranges of colic, laminitis, metabolic issues and vices along with the equally hazardous longterm effects of our "cures" *I* believe by interfering with the natural working systems within the horse. The human is still trying to make the horse something he is not and the horse continues to try to keep up : )
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"....there is no normal life, Wyatt, there's just life..."