1241-349 - Wild male bull bison (buffalo) in summer, Elk Island National Park, Alberta, Canada, North America

1116-51443 - Falling snow clings to an American Bison bull (Bison bison) standing in a meadow in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1116-51444 - American Bison bull (Bison bison) on a snowy day in the North Fork of the Shoshone River valley near Yellowstone National Park; Wyoming, United States of America

1350-221 - Adult bull American Bison buffalo ( Bos bison ) with Brown-headed Cowbird ( Molothrus ater ) on back in prairie landscape at Riding Mountain National Park Manitoba Canada

1116-50258 - Wood bison bull (Bison bison athabascae) portrait, Alaska Wildlife Conservation Center in South-central Alaska. The Alaska Wildlife Conservation Center played a big part in helping reintroduce these animals back into the Alaska wilds; Portage, Alaska, United States of America

1116-50351 - American Bison bull (Bison bison) plowing through deep snow in the Firehole River Valley, Yellowstone National Park; Wyoming, United States of America

1116-50350 - American Bison bull (Bison bison) walking through winter snow in the Lamar Valley, Yellowstone National Park; Wyoming, United States of America

1116-50346 - 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

1116-47605 - A large Wood bison bull (Bison bison athabascae) in snow, captive in Alaska Wildlife Conservation Center, Portage, Alaska, United States of America

746-89404 - A herd of bison moving along the Yellowstone National Park, Wyoming, USA.

764-5668 - Bison (Bison bison) bull covered with snow in snowfall in the winter, Yellowstone National Park, Wyoming, United States of America, North America

1200-8 - European bison (Bison bonasus) bull walking in snow covered forest habitat in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

1200-6 - European bison (Bison bonasus) bull, standing in snow covered meadow in February, with yellowhammer (Emberiza citrinella) flock in flight, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

1200-3 - European bison (Bison bonasus) bull with radio tracking collar, standing in snow covered forest habitat in February, Bialowieza National Park, Podlaskie Voivodeship, Poland, Europe

764-4839 - Bison (Bison bison) bull in the spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

764-4853 - Bison (Bison bison) bull in a spring snowstorm, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

764-4776 - Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

764-4775 - Bison (Bison bison) bull covered with snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

764-4765 - Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

764-4768 - Bison (Bison bison) bull covered with snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

764-4716 - Bison (Bison bison) bull, Custer State Park, South Dakota, United States of America, North America

832-368088 - American Bison (Bison bison), bull crossing a road in front of a car, Yellowstone National Park, Wyoming, USA

764-4510 - Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

764-4483 - Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

764-4485 - Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

764-3943 - Bison (Bison bison) bull in the snow, Yellowstone National Park, Wyoming, United States of America, North America

764-3942 - Bison (Bison bison) bull in the snow, Yellowstone National Park, Wyoming, United States of America, North America

764-3939 - Bison (Bison bison) bull in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

832-132976 - Bison (Bison bison), bull, Yellowstone National Park, Wyoming, USA, North America

832-132975 - Bison (Bison bison), bull, Yellowstone National Park, Wyoming, USA, North America

857-18553 - A bison bull strolls by a wildlife photographer on the road of the Hayden Valley, Yellowstone National Park.

764-3627 - Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

764-3428 - Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

764-3432 - Bison (Bison bison) bull and cow, Yellowstone National Park, Wyoming, United States of America, North America

764-3431 - Bison (Bison bison) bull among yellow wildflowers, Yellowstone National Park, Wyoming, United States of America, North America

764-3077 - Bison (Bison bison) bull demonstrating the flehmen response, Yellowstone National Park, Wyoming, United States of America, North America

832-9482 - American Buffalo (Bison bison), portrait of a bull in heat, Yellowstone National Park, Wyoming, USA

817-128444 - American Bison/Buffalo (Bison bison), Bull, Custer State Park, South Dakota, USA

817-158369 - Bisons at ALTAMIRA NEO CAVE MUSEUM - Santillana del Mar - Cantabria - Spain

817-153291 - Wisent,bull,(Bison bonasus)

764-1047 - Two bison (Bison bison) bulls facing off, Yellowstone National Park, Wyoming, United States of America, North America