A heavy, shod horse tromping around and pooping all over the place is going to do far more trail damage than mountain bikes.
A heavy, shod horse tromping around and pooping all over the place is going to do far more trail damage than mountain bikes.
A ref: https://www.imba.com/resources/research/trail-science/enviro...
Also, remember that horses are not an indigenous species in recorded history in North America.
I don't think one should consider nativity very much when deciding if something is good or not in a given context. More what the impact is, irrespective of nativity.
Never the less, bikes are even less native than horses... At least horses are organic.
Horse riders can always look back to a time when what they now do for sport used to be the only form of transit.
I come from a family of horse riders, and am a mountain biker. Really, it is completely possible to get along and share the trails. Obviously, some trails are only going to work for mountain bikes, and some are much nicer for horses (and boring for bikers).
I'd love to see horse riders required to clean up after their horses, just like dog owners clean up after their dogs. It's your pet, clean up.
On a more serious note, a major problem with animal feces on trails that are shared with bikers is the risk it poses when you run it over, and it splatters all over the place. If it gets in your mouth, or on the nozzle of your water bottle or camelback, you can get sick.