A hilarious video has emerged from the US of a mother freaking out when she sees a bison ambling towards her vehicle.<br /><br />The footage, captured at the Yellowstone National Park by her son, shows the woman going into hysterics while the large bison saunters past. <br /><br />The woman can be heard screaming "nooooo!" as the animal makes its way past the car in an unthreatening and leisurely manner. <br /><br />"With any other person it would have been a quiet moment, instead it was full of my mom screaming and both of us telling each other to shut up," her son wrote online.
