Growing up in Nebraska I worked on my friends buffalo ranch. They do not like you in their space, by the time I joined the military the old Ford F 350 we used was beat to crap by charging buffalo!
Something cool about buffalo, they make a lot of noise. Lots of grunting vocalizing when bunched up grazing, very interesting to listen to. Besides the park, there used to be a buffalo ranch nearby, Id often stop by the road on the way home and just watch and listen to them.