Pair of American Bison bulls (Bison bison) walking through the 'Bobby Socks' trees in the Firehole River Valley of Yellowstone National Park; Wyoming, United States of America

winter weather outdoors day daytime animal color colour close up together landmark america walking togetherness landmarks american friendship tourism snowy usa friends bison buffalo bull yellowstone wyoming us us bulls wintertime snow covered local landmark the states two animals full length tourist attractions attractions bison bison destinations animals pair wildlife snow outside nobody vertical forest attraction destination travel national parks national park color image american bison united states of america close up tourist attraction travel destination travel destinations non urban scene animals in the wild place of interest colour image no one no people the rocky states wy state of wyoming male animal local landmarks places of interest male animals bull bison front view closeup usa two bison firehole river valley bobby socks tree bobby socks trees