These are the exact same people and groups that have been protesting Sea World and their Shamu shows. And they just scored a huge win against Sea World at the California Coastal Commission last week, effectively shutting down Sea World San Diego within a few years.
It's no surprise these Leftist groups are now turning their attention to horses working in theme parks.
Even though Disneyland's horse ranch appears to be moving off property for Star Wars Land construction and Disneyland says the horses will continue to work at Disneyland... I will be very, very surprised if the horse-drawn streetcars still exist at Disneyland by 2020. They'll go after Knott's Berry Farm's stagecoach ride first because it's an easier target. But once they win the first horse battle, they'll turn to Disneyland very quickly.