Donald M. Jones / Minden / Bighorn Sheep (Ovis canadensis) ram, western Canada

Danny Green / Big horn sheep (Ovis canadensis) male looking down from snowy ledge, portrait. Yellowstone National Park, USA, January.

Niall Benvie / Black faced sheep ram with twisted horns, Mull, Scotland, UK. January.

Charlie Summers / Rocky mountain bighorn (Ovis canadensis) ram jumping a barbed wire fence, Montana, USA,

Alex Mustard,Alex Mustard / Whaleshark (Rhincodon typus) swimming and filtering fish eggs from the water. A behaviour known as ram-feeding. Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico. Caribbean Sea.

Richard Du Toit / Springbok ram calling (Antidorcas marsupialis) Kalahari, South Africa, January

Angelo Gandolfi / Mouflon ram (Ovis musimon) portrait, standing in forest, Foret de Valdu Niellu, Corte, Parc Naturel Regional de Corse, Corsica island, France, February

Patricio Robles Gil / Bighorn sheep (Ovis canadensis) ram grazing in snow, Wind River Range, Wyoming, USA, January

Colin Seddon / Scottish black-faced breed ram {Ovis aries} Scotland, UK

Matthias Breiter / Dall's Sheep (Ovis dalli) ram portrait on rock outcrop, Denali National Park and Preserve, Alaska

Matthias Breiter / Dall's Sheep (Ovis dalli) ram with split horn, Denali National Park and Preserve, Alaska

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada

Donald M. Jones / Dall's Sheep (Ovis dalli) ram, Denali National Park, Alaska

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ewe and ram, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Canada

Michael Quinton / Dall's Sheep (Ovis dalli) ram, lamb, and ewe, Yukon Territory, Canada

Donald M. Jones / Dall's Sheep (Ovis dalli) rams posturing, central Alaska

Donald M. Jones / Dall's Sheep (Ovis dalli) rams posturing, central Alaska

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, ewe, and lamb, western Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Canada

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams in tundra, western Canada

Donald M. Jones / Desert Bighorn Sheep (Ovis canadensis nelsoni) rams, North America

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram in snowfall, Yellowstone National Park, Wyoming

Sumio Harada / Bighorn Sheep (Ovis canadensis) rams pursuing ewe in snowstorm, Glacier National Park, Montana

Sumio Harada / Bighorn Sheep (Ovis canadensis) rams and a female on snowy cliff face, Glacier National Park, Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram and ewe during rut, Montana

Mark Raycroft / Bighorn Sheep (Ovis canadensis) rams in a line with one standing out front, North America

Mark Raycroft / Bighorn Sheep (Ovis canadensis) ram, North America

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram and female, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) rams, western Montana

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram in alpine zone, northern Rocky Mountains, Canada

Donald M. Jones / Dall's Sheep (Ovis dalli) rams, Denali National Park, Alaska

Donald M. Jones / Dall's Sheep (Ovis dalli) rams, Denali National Park, Alaska

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Montana

Donald M. Jones / Dall's Sheep (Ovis dalli) ram, central Alaska

Donald M. Jones / Dall's Sheep (Ovis dalli) bedded ram, central Alaska

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

Donald M. Jones / Dall's Sheep (Ovis dalli) ram, central Alaska

Donald M. Jones / Bighorn Sheep (Ovis canadensis) ram, western Alberta, Canada