Slower moving wildlife can easily be avoided. Horses and riders did not disturb birds. Sporadic human use can disturb wildlife. Riders seldom dismount to touch flora or fauna. Riders can be a dedicated and energetic volunteer and advocacy group.
Horses are useful for patrols and surveys.
Horse traffic can be used to maintain firebreaks and seldom-used trails. Horses in many ways may be more compatible with wildlife than other user groups. There is no documented evidence of the horse spreading weeds. It is unknown to what extent high quality livestock forage available contains weed seeds. However, most horse owners would not buy junk hay for their horses.