An adult bull porcupine caribou (Rangifer tarandus granti), hiding in fall color changes in Denali National Park, Alaska, United States of America, North America

Bull elk near Firehole River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bull porcupine caribou (Grant's caribou) (Rangifer tarandus granti), Denali National Park, Alaska, United States of America

Caribou, rangifer tarandus. Male/ bull in tundra; usa, alaska (alaska range in background) .

Caribou, rangifer tarandus. Male/ bull in tundra; usa, alaska (alaska range in background) .

Caribou. Rangifer tarandus. Male/ bull in autumn tundra. Denali n.p, alaska, usa

Caribou, rangifer tarandus. Male/ bull in tundra; usa, alaska (alaska range in background)

Caribou, rangifer tarandus. Male/ bull in tundra; usa, alaska (alaska range in background) .

Wild mountain reindeer (Rangifer tarandus tarandus), bull courting female, in autumn tundra, Forollhogna National Park, Norway, Europe

Wild mountain reindeer (Rangifer tarandus tarandus), bull in autumn tundra, Forollhogna National Park, Norway, Europe

Wild mountain reindeer (Rangifer tarandus tarandus), bull courting female, in autumn tundra, Forollhogna National Park, Norway, Europe

Bull Caribou (Rangifer Tarandus Caribou) Feed In A Spruce Bog Near Wonder Lake, Denali National Park And Preserve, Alaska, United States Of America

Caribou Bull (Rangifer Tarandus) With Velvet Antlers, Feeding On Tundra Vegetation, Denali National Park And Preserve, Alaska, Usa

Caribou Bull (Rangifer Tarandus) With Velvet Antlers, Denali National Park And Preserve, Alaska, Usa

Caribou Bull (Rangifer Tarandus), Denali National Park And Preserve, Alaska, Usa