 Bull lying in a field near Vinales, Cuba
 Scottish Highland Cattle, young bull, mixed-breed, Cornwall, England, United Kingdom
 Bull at sunrise, Alicante, Spain
 Caribou bull Rangifer tarandus silhouetted
 Caribou bull standing on a ridgeline with Mt. McKinley and Denali National Park in the background, Alaska. COMPOSITE
 Svalbard reindeer (Rangifer tarandus platyrhynchus) bull grazing in Longyearbyen Svalbard / Spitsbergen, Norway
 Battered old bull buffalo with attendant cleaning squad of Oxpecker birds one removing ticks from his ear - Tsavo East Kenya
 Bull Moose
 red deer (Cervus elaphus), silhouette of a bull in front of winterly sunset, Austria, Vorarlberg
 Bull caribou, Denali National Park, Alaska.
 African Elephant (Loxodonta africana) bull, taking dust bath, Kruger national park, South Africa.
 Bull Moose - adult male Shiras Moose - Alces alces
 Grey Seal, Halichoerus grypus bull in sand dunes
 Bull moose standing in sagebrush meadow in autumn
 Bull Moose racing across the Snake River in Grand Teton National Park.
 Bull moose (Alces alces) in velvet, Roosevelt National Forest, Colorado, United States of America
 Adult bull African Elephant feeding on foliage on the banks of the Luangwa River. South Luangwa National Park, Zambia
 African elephant bull spraying dust on injured eye to minimize fly annoyance (Loxodonta africana), Moremi National Park, Okavango delta, Botswana,
 Bull African buffalo
 a bull impala, Kruger National Park, South Africa
 Scottish Highland Cattle, young bull, mixed-breed, Cornwall, England, United Kingdom
 Kudu bull - Tragelaphus strepsiceros, Mana Pools National Park, Zimbabwe
 Caribou bull Rangifer tarandus silhouetted
 A wide-angle view of a bull moose standing at the Alaska Widllife Conservation Center, Southcentral Alaska, Winter. CAPTIVE
 American bison / American buffalo (Bison bison) bull in summer, Waterton Lakes National Park, Alberta, Canada
 Plains Bison, bull, or Buffalo (Bison bison bison) in winter, Manitoba, Canada.
 Bull Moose
 red deer (Cervus elaphus), silhouette of a bull in front of winterly sunset, Austria, Vorarlberg
 Bull caribou, Denali National Park, Alaska.
 A bull moose standing in sagebrush as winter begins to set in. Grand Teton National Park, Wyoming
 Bull Moose - adult male Shiras Moose - Alces alces
 Kevin The Bull
 Flehmen response by bull moose over cow moose in middle of rut in autumn
 Mature bull moose in a snowstorm
 Fazenda, bull, Ilha do Marajo, Amazon delta, Amazonia, Brazil, South America, agriculture, animal
 Adult bull African Elephant feeding on foliage on the banks of the Luangwa River. South Luangwa National Park, Zambia
 African elephant bull spraying dust on injured eye to minimize fly annoyance (Loxodonta africana), Moremi National Park, Okavango delta, Botswana,
 African buffalo bull, head close up
 a bull impala, Kruger National Park, South Africa
 African Buffalo (Syncerus caffer caffer), bull, South Luangwa National Park, Zambia
 Kudu bull - Tragelaphus strepsiceros, Mana Pools National Park, Zimbabwe
 Caribou bull Rangifer tarandus silhouetted
 Bull caribou and tundra pond with Mt. McKinley in the background, Denali National Park, Alaska COMPOSITE
 Elk / wapiti (Cervus canadensis) bull with velvet dangling from antlers in summer, Jasper National Park, Alberta, Canada
 CAPTIVE: Bull moose walks thru high-tide water, Alaska Wildlife Conservation Center, Southcentral Alaska, Autumn
 Bull Moose
 red deer (Cervus elaphus), bull standing on a snow-covered slope at sunset, Austria, Vorarlberg
 South Africa, a fantastic travel destination to experience third and first world together. Buffalo bull licking nostrils clean with its tongue.
 A bull moose with wet fur walks out from fall cottonwood trees in Grand Teton National Park, Wyoming.
 Buffalo Bull enjoying a mud bath
 Buffalo (Syncerus caffer caffer), Lake Manyara National Park, Tanzania
 Bull moose in a snowy field
 American bullfrog (Lithobates catesbeianus or Rana catesbeiana) portrait, Ledges State Park, Iowa, USA.
 Fazenda, bull, Ilha do Marajo, Amazon delta, Amazonia, Brazil, South America, agriculture, animal
 Adult bull African Elephant feeding. Banks of the Luangwa River. South Luangwa National Park, Zambia.
 Bull caribou, Denali National Park, Alaska.
 highland cow
 a bull impala, Kruger National Park, South Africa
 African Buffalo (Syncerus caffer caffer), bull, South Luangwa National Park, Zambia
 African elephant bull (Loxodonta africana), Kruger National Park, Mpumalanga, South Africa, Africa
 Caribou bull Rangifer tarandus silhouetted
 An adult bull Roosevelt elk walks through a pond while bugling, near Portage, Alaska, Autumnm. CAPTIVE
 Heck cattle (Bos domesticus) bull under tree in the snow in winter. Attempt to breed back the extinct aurochs (Bos primigenius)
 CAPTIVE: Bull moose walks thru high-tide water, Alaska Wildlife Conservation Center, Southcentral Alaska, Autumn
 Bull Moose
 red deer (Cervus elaphus), bull standing on a snow-covered slope at sunset, Austria, Vorarlberg
 South Africa, a fantastic travel destination to experience third and first world together. Lone buffalo bull plodding at sunset. Addo Elephant park.
 Close up of English Longhorn bull with a nose ring.
 Buffalo Bull after enjoying a mud bath
 Buffalo (Syncerus caffer caffer), Lake Manyara National Park, Tanzania
 Bull moose in a snowy field
 Bull Moose
 Wild African buffalo bull. Africa, Kenya
 Adult bull African Elephant feeding. Banks of the Luangwa River. South Luangwa National Park, Zambia.
 Bull caribou, Denali National Park, Alaska.
 Large African elephant bull (Loxodonta africana), Addo Elephant National park, South Africa
 waterbuck bull in the bush, Kruger National park, South Africa
 Cape buffalo, African Buffalo (Syncerus caffer) bull in dry grass, Ngorongoro, Serengeti National Park, Tanzania
 Black Fighting Bull (Bos primigenius, Bos taurus) on a meadow
 Caribou bull Rangifer tarandus silhouetted
 Bull Caribou stands alongside the George Parks Highway with frosty breath showing in early morning Light, Cantwell area, Alaska
 Heck cattle (Bos domesticus) bull under tree in the snow in winter. Attempt to breed back the extinct aurochs (Bos primigenius)
 CAPTIVE: Bull moose walks thru high-tide water, Alaska Wildlife Conservation Center, Southcentral Alaska, Autumn
 Bull Moose
 American bison, buffalo (Bison bison), bull, USA, Wyoming, Yellowstone National Park, Hayden Valley
 Hereford bull with Friesian heifers on a misty August morning
 Close up of English Longhorn bull with a nose ring.
 Running American Buffalo Bull (Bison bison) Close Up
 Buffalo bull (Syncerus caffer caffer), Ngorongoro Crater, Tanzania
 Bull Moose in Alaska during the fall rut
 Bull Moose
 welsh black bull on scenic hill
 Two elephants tussle
 Bull caribou, Denali National Park, Alaska.
 Muskox bull (Ovibos moschatus), Myggebukta (Mosquito Bay), Christian X's Land, Northeast Greenland, Polar Regions
 the horns of a bull impala, Kruger National Park, South Africa
 Cape buffalo, African Buffalo (Syncerus caffer) bull running in dry grass, Ngorongoro, Serengeti National Park, Tanzania
 Highland bull at Alverstone on the Isle of Wight
 Muskoxen (Ovibos moschatus) bull, Victoria Island, Nunavut, Arctic Canada
 Two bull musk ox in a confrontation during the rutting season at Alaska Wildlife Conservation Center, Alaska. Captive
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