Other parks have their elk or moose or bear or even wolf. Who but a Texas state park would claim feral longhorns?  Up until 2008 the park managed a free range longhorn herd with annual roundups to cull and brand then re-release.  That year they got out of the ranching business with a huge roundup with cowpokes from all across Texas signing up to gather the wandering beasts to sell off most and keep only a small heritage herd in a fenced in area.  Seems they were not entirely successful and hikers periodically report encounters with increasingly cantankerous free range longhorns sharing the trails.  We had no such encounter, thankfully, but roadside cow flops lend some credence to the hikers’ claims.