Bison (Bison bison) bull demonstrating the flehmen response, Yellowstone National Park, Wyoming, United States of America, North America

travel destination tourist destination photography colour image colour vertical bison bison bison bull flehmen response yellowstone national park wyoming united states of america north america outdoors outside day no people nobody no one no one animal themes one animal head and shoulders side view wildlife animals in the wild non urban scene national park brown nature the natural world calling animal behaviour sensory perception animal head snout horn