North American timber wolf (Canis Lupus) howling in the snow in forest, Wolf Science Centre, Ernstbrunn, Austria, Europe

North American timber wolf (Canis lupus) in forest, Wolf Science Centre, Ernstbrunn, Austria, Europe

North American Timber wolf, Canis Lupus howling in the snow in deciduous forest.

North American timber wolf (Canis lupus) in forest, Wolf Science Centre, Ernstbrunn, Austria, Europe

North American timber wolf (Canis Lupus) howling in the snow in deciduous forest, Wolf Science Centre, Ernstbrunn, Austria, Europe

North American timber wolf (Canis lupus) in forest, Wolf Science Centre, Ernstbrunn, Austria, Europe

Two sub adult North American Timber wolves (Canis lupus) in snow, Austria, Europe

Close-up of face and snout of a North American Timber wolf (Canis lupus) in forest, Austria, Europe

North American Timber wolf (Canis lupus) in forest, Austria, Europe

Two black melanistic variants of North American Timber wolf (Canis Lupus) in snow, Austria, Europe

Black melanistic variant of North American timber wolf (Canis Lupus) in snow, Austria, Europe