It's a modern question for the ages... who's using who?
Horses, as a food source, may well have gone extinct if ancient man hadn't discovered that they could be tamed and ridden. That fact advanced civilisation by a huge factor.
Today there are more horses alive than at any time in history. In western society, where motor vehicles have replaced the overall need for horses, humans now transport them.
Could this be the pallet's ultimate goal?!?
Also, one large stone in a rail and that bloke is going 'arse over tea kettle'.