TOM MANGELSEN / Male Resplendent quetzal (Pharomachrus mocinno) perched at its nest hole, El Triunfo Biosphere Reserve, Sierra Madre de Chiapas, Mexico.

TOM MANGELSEN / Polar Bear (Ursus maritimus) portrait, Canada

TOM MANGELSEN / Polar bears relaxing, Hudson Bay Canada

TOM MANGELSEN / Arctic Fox in snow, Canada. (Vulpes lagopus)

TOM MANGELSEN / Siberian Tiger cub orphan (Panthera tigris altaica) Omaha Zoo, Nebraska

TOM MANGELSEN / Polar bears (Ursus maritimus) on ice at sunset. Hudson Bay, Canada.

TOM MANGELSEN / Siberian Tiger cub, orphaned (Panthera tigris altaica)

TOM MANGELSEN / Arctic Fox sitting portrait, Canada (Vulpes lagopus)

TOM MANGELSEN / Arctic Fox on ice, Canada (Vulpes lagopus)

TOM MANGELSEN / Arctic Fox sitting at sunset. Canada (Vulpes lagopus)

TOM MANGELSEN / Polar Bear mother and cubs (Ursus maritimus) Churchill, Manitoba, Canada

TOM MANGELSEN / Brown bear (Ursus arctos) Kodiak NP, Alaska