John Cancalosi / White / Dall sheep {Ovis dalli} ram in snow, Yukon, Canada

George McCarthy / Dall / Stone Sheep (Ovis dalli) on scree mountain-side, Alaska, USA

Philippe Clement / Dall sheep {Ovis dalli} male grazing on leaves, Denali NP, Alaska, USA

Philippe Clement / Dall sheep ewe {Ovis dalli} Denali NP, Alaska, USA

Steven Kazlowski / Dall sheep {Ovis Dalli} portrait, Denali National Park, Alaska, USA. One horn broken

Steven Kazlowski / Dall sheep {Ovis Dalli} female resting on hillside, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep {Ovis Dalli} female portrait resting on hillside, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep herd {Ovis Dalli} resting on hillside, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep herd {Ovis Dalli} resting on hillside, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep herd {Ovis Dalli} resting on hillside, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep herd {Ovis Dalli} resting, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep {Ovis Dalli} female with juvenile, Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep {Ovis Dalli}female with juvenile, Denali National Park, Alaska, USA.

Steven Kazlowski / Young Dall sheep {Ovis Dalli} juvenile portrait, Denali National Park, Alaska, USA.

Steven Kazlowski / Young Dall sheep {Ovis Dalli} juvenile portrait, Denali National Park, Alaska, USA.

Steven Kazlowski / Group of Dall sheep females and young {Ovis Dalli} Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep male portrait {Ovis Dalli} Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep male resting {Ovis Dalli} Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep male {Ovis Dalli} Denali National Park, Alaska, USA.

Steven Kazlowski / Dall sheep male portrait {Ovis Dalli} Denali National Park, Alaska, USA.

Steven Kazlowski / Group of Dall sheep {Ovis Dalli} Denali National Park, Alaska, USA.

Jeff Vanuga / Dall sheep flock {Ovis dalli} Kluane NP, Yukon, Canada.

Jeff Vanuga / Dall sheep ewe and lamb {Ovis dalli} Kluane NP, Yukon, Canada.

Jeff Vanuga / Dall sheep {Ovis dalli} Kluane NP, Yukon, Canada.

Patricio Robles Gil / Stone sheep {Ovis dalli stony} Stone Mountains, British Columbia, Canada

Patricio Robles Gil / Stone sheep on cliff {Ovis dalli stony} Stone Mountains, British Columbia, Canada

Patricio Robles Gil / Stone sheep on cliff {Ovis dalli stony} Stone Mountains, British Columbia, Canada

Patricio Robles Gil / Dall sheep {Ovis dalli} Kluane NP, Yukon, Canada

Patricio Robles Gil / Dall sheep {Ovis dalli} Kluane NP, Yukon, Canada

Patricio Robles Gil / Stone sheep ram {Ovis dalli stony} Stone Mt, British Columbia, Canada.

Patricio Robles Gil / Stone sheep ram {Ovis dalli stony} Stone Mt, British Columbia, Canada.

Patricio Robles Gil / Stone sheep + lamb {Ovis dalli stony} Stone Mt, British Columbia, Canada. wild

Patricio Robles Gil / Stone sheep {Ovis dalli stony} Stone Mt, British Columbia, Canada. Wild

John Cancalosi / Dall sheep ram portrait in snow {Ovis dalli} Yukon, USA

TOM MANGELSEN / Dall Sheep (Ovis dalli) Denali NP, Alaska, USA.

Suzi Eszterhas / Dall's Sheep (Ovis dalli) pair, Denali National Park, Alaska

Suzi Eszterhas / Dall's Sheep (Ovis dalli) on steep slope, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Dall's Sheep (Ovis dalli) ram, Denali National Park, Alaska

Yva Momatiuk & John Eastcott / Dall's Sheep (Ovis dalli) sub-adult ram, Denali National Park, Alaska

Mark Raycroft / Dall's Sheep (Ovis dalli) rams, North America

Mark Raycroft / Dall's Sheep (Ovis dalli) ram, North America

Mark Raycroft / Dall's Sheep (Ovis dalli) ram, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram portrait, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram grazing on dried grasses and lichen in the winter, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) female and kid, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram portrait, North America

Patricio Robles Gil / Dall's Sheep (Ovis dalli) ram portrait, Canada

Patricio Robles Gil / Dall's Sheep (Ovis dalli) male portrait, Canada