Red deer stag (Cervus elaphus), captive, Highland Wildlife Park, Kingussie, Scotland, United Kingdom, Europe

Red deer stag (Cervus elaphus) in autumn, Glen Strathfarrar, Inverness-shire, Highland Region, Scotland, United Kingdom, Europe

Elk standing near tree

Alaskan bull moose (alces alces gigas) walks through the rain, Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Massive elk bull (cervus canadensis) with a seven point rack in the autumn colored forest , Yukon Territory, Canada

Massive elk bull (cervus canadensis) in the dark forest, Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) in Yukon Territory, Canada

Elk bull (cervus canadensis) in fall, Yukon Territory, Canada

Silhouette of elk bull and elk cow (cervus canadensis) in the matting season, Yukon Territory, Canada

Alaskan bull moose (alces alces gigas) walks through the rain, Yukon Territory, Canada

Silhouette of a big elk bull (cervus canadensis), Yukon Territory, Canada

An elk bull, cervus canadensis, in the fall rutting season, Yukon Territory, Canada

Massive elk bull (cervus canadensis) in the dark forest, Yukon Territory, Canada

Silhouette of a young elk bull (cervus canadensis), Yukon Territory, Canada

Elk bull (cervus canadensis) in forest, half covered by a tree, Yukon Territory, Canada

An elk bull, cervus canadensis, in the fall rutting season, Yukon Territory, Canada

Rocky Mountain Elk at Oak Creek Wildlife Area winter feeding station, Washington.

Elk bull (cervus canadensis) stands on hill top, Yukon Territory, Canada

A big elk bull (cervus canadensis) in the rain on a fall day, Yukon Territory, Canada

Elk bull (cervus canadensis) in fall, Yukon Territory, Canada

Bull Elk

Caribou Walking On Hill Crest

Dehavilland Beaver taking off from tundra bush airstrip in late summer, with a caribou rack marking the end of the runway, Brooks Range, Upper Marsh Fork Valley, Arctic National Wildlife Refuge; Alaska, United States of America

A caribou rack lit up by the sun, marks the end of a remote bush airstrip in the Upper Marsh Fork Valley, Brooks Range, Arctic National Wildlife Refuge; Alaska, United States of America

Portrait of a bull moose (Alces alces) walking through an alpine meadow late in the rut in Southcentral Alaska's Chugach State Park, Alaska, United States of America

Bull moose (Alces alces) pauses late in the rut in South-central Alaska's Chugach State Park, Anchorage, Alaska, United States of America

A bull moose (Alces alces) resting in a forest on Fort Greely; Alaska, United States of America

Bull moose (Alces alces) is startled as a jealous cow threatens a competitor during the rut, or breeding season, in Southcentral Alaska's Chugach State Park, USA, Alaska, United States of America

Approached by a cow moose, a bull (Alces alces), displays the Flehmen response late in the rut in Southcentral Alaska's Chugach State Park, Anchorage, Alaska, United States of America

Bull moose (Alces alces) wades through the mist of a cool Southcentral Alaska evening during the September 'rut', or breeding season. Moose are the largest member of the deer family. The animals are circumpolar and the Alaska-Yukon race, Alces alces gigas, is the largest of all, Alaska, United States of America

Alaska bull moose (Alces alces) patrols a marsh during the rut, or fall breeding season, in mid-September, Anchorage, Alaska, United States of America

A Bull Moose Stands In The Middle Of Denali Park Road, In Denali National Park And Preserve, With The Mountains In The Background In Autumn, Alaska, United States Of America

Mature bull moose (Alces alces) with a large rack of antlers spanning close to two meters (six feet) wide, pauses late in the rut in Southcentral Alaska's Chugach State Park, Alaska, United States of America

An Elk's Horns Lay In The Water At Astotin Lake In Elk Island National Park; Alberta, Canada