• Landscape with purple colours, mountains, forest and snowfield. South Ural, Russia. This image... [Photo of the day - December 2017]
    Landscape with purple colours, mountains, forest and snowfield. South Ural, Russia. This image is from Siberia's Wild Year.
    iStock
  • Limpopo, South Africa:  Earl. This image is from Little Monkey House. [Photo of the day - December 2017]
    Limpopo, South Africa: Earl. This image is from Little Monkey House.
    Magic Monkey LLC/Kyle Salazar
  • El Hierro, Spain:  Underwater cameraman. This image is from The New Sperm Whale . [Photo of the day - December 2017]
    El Hierro, Spain: Underwater cameraman. This image is from The New Sperm Whale .
    Saint Thomas Productions
  • Volcanoes National Park, Rwanda:  Young gorilla face in mothers arms in the mountains. This... [Photo of the day - December 2017]
    Volcanoes National Park, Rwanda: Young gorilla face in mothers arms in the mountains. This image is from Dian Fossey: Secrets in the Mist.
    National Geographic/John Shiers
  • Canada, Homer, AK:  Alpacas at Arla Ranch. This image is from Dr. Oakley: Yukon Vet. [Photo of the day - December 2017]
    Canada, Homer, AK: Alpacas at Arla Ranch. This image is from Dr. Oakley: Yukon Vet.
    Lucky Dog Films/Mark Hendon
  • Social climbing. This image is from Who's Aping Who? [Photo of the day - December 2017]
    Social climbing. This image is from Who's Aping Who?
    Michael Nichols
  • Siberia:  In winter, reindeer dig through the snow in search of carbohydrate rich lichens called... [Photo of the day - December 2017]
    Siberia: In winter, reindeer dig through the snow in search of carbohydrate rich lichens called reindeer moss. This image is from Siberia's Wild Year.
    iStock
  • Jerusalem, Israel:  Dome of the Rock, iconic church in Jerusalem. This image is from Secrets of... [Photo of the day - December 2017]
    Jerusalem, Israel: Dome of the Rock, iconic church in Jerusalem. This image is from Secrets of Christ’s Tomb: Explorer Special.
    National Geographic/Crispin Green
  • Titanic being pulled out to sea in Belfast.  This image is from Titanic's Fatal Fire. [Photo of the day - December 2017]
    Titanic being pulled out to sea in Belfast. This image is from Titanic's Fatal Fire.
    Steve Raffled
  • Volcanoes National Park, Rwanda:  Young gorilla face in the mountains. This image is from Dian... [Photo of the day - December 2017]
    Volcanoes National Park, Rwanda: Young gorilla face in the mountains. This image is from Dian Fossey: Secrets in the Mist.
    National Geographic/John Shiers
  • Canada, Vancouver, BC: A harbour seal pup at the Vancouver Aquarium Marine Mammal Rescue Center.... [Photo of the day - December 2017]
    Canada, Vancouver, BC: A harbour seal pup at the Vancouver Aquarium Marine Mammal Rescue Center. This image is from Dr. Oakley: Yukon Vet.
    Lucky Dog Films/Mark Hendon
  • Limpopo, South Africa:  Kate sits on a branch in Disneyland on one of her first days at the... [Photo of the day - December 2017]
    Limpopo, South Africa: Kate sits on a branch in Disneyland on one of her first days at the Vervet Monkey Foundation. This image is from Little Monkey House.
    Magic Monkey LLC/Kyle Salazar
  • (L to R)  James Cameron and Bob Ballard. Titanic at the Reagan Library. This image is from... [Photo of the day - December 2017]
    (L to R) James Cameron and Bob Ballard. Titanic at the Reagan Library. This image is from Titanic: 20 Years Later with James Cameron.
    2017 by Mark Fellman
  • Bringing up baby. This image is from Who's Aping Who? [Photo of the day - December 2017]
    Bringing up baby. This image is from Who's Aping Who?
    Michael Nichols
  • California:  Ranger John Cantwell, National Parks Service. This image is from Drain Alcatraz. [Photo of the day - December 2017]
    California: Ranger John Cantwell, National Parks Service. This image is from Drain Alcatraz.
    Northern Sky Entertainment/Wayne Abbott
  • Siberia:  Red crowned cranes pair for life and each spring they renew their bond by performing a... [Photo of the day - December 2017]
    Siberia: Red crowned cranes pair for life and each spring they renew their bond by performing a courtship dance. This image is from Siberia's Wild Year.
    iStock
  • Dian Fossey holds a mountain gorilla that she nursed back to health. This image is from Dian... [Photo of the day - December 2017]
    Dian Fossey holds a mountain gorilla that she nursed back to health. This image is from Dian Fossey: Secrets in the Mist.
    ROBERT I.M. CAMPBELL
  • Chile:  A Killer Whale surfaces. This image is from The New Sperm Whale . [Photo of the day - December 2017]
    Chile: A Killer Whale surfaces. This image is from The New Sperm Whale .
    SAINT THOMAS PROD
  • Northern Territory, Australia:  Sunset in the Northern Territory. This image is from Monster... [Photo of the day - December 2017]
    Northern Territory, Australia: Sunset in the Northern Territory. This image is from Monster Croc Wrangler.
    National Geographic/Daniel Walkington
  • Vancouver, BC:  A baby otter receives a checkup at the Vancouver Aquarium Marine Mammal Rescue... [Photo of the day - December 2017]
    Vancouver, BC: A baby otter receives a checkup at the Vancouver Aquarium Marine Mammal Rescue Center. This image is from Dr. Oakley: Yukon Vet.
    Lucky Dog Films/Mark Hendon
  • California:  Cliffs on the western side of Alcatraz Island. This image is from Drain Alcatraz. [Photo of the day - December 2017]
    California: Cliffs on the western side of Alcatraz Island. This image is from Drain Alcatraz.
    Northern Sky Entertainment/Wayne Abbott
  • Limpopo, South Africa:  (L to R) Dudley chews on a carrot in Disneyland while Korigan watches.... [Photo of the day - December 2017]
    Limpopo, South Africa: (L to R) Dudley chews on a carrot in Disneyland while Korigan watches. This image is from Little Monkey House.
    Magic Monkey LLC/Kyle Salazar
  • Canary Islands, Spain:  Dolphins jumping out of the water. This image is from The New Sperm Whale . [Photo of the day - December 2017]
    Canary Islands, Spain: Dolphins jumping out of the water. This image is from The New Sperm Whale .
    SAINT THOMAS PROD
  • Dian Fossey in the wild with Mountain Gorillas. This image is from Dian Fossey: Secrets in the Mist. [Photo of the day - December 2017]
    Dian Fossey in the wild with Mountain Gorillas. This image is from Dian Fossey: Secrets in the Mist.
    ROBERT I.M. CAMPBELL
  • Siberia:  Pacific walruses migrate north during spring and as many as 20,000 haul out along ... [Photo of the day - December 2017]
    Siberia: Pacific walruses migrate north during spring and as many as 20,000 haul out along Siberia's coast. This image is from Siberia's Wild Year.
    iStock
  • Horse eating with Dr. Oakley and Sierra in background. This image is from Dr. Oakley: Yukon Vet. [Photo of the day - December 2017]
    Horse eating with Dr. Oakley and Sierra in background. This image is from Dr. Oakley: Yukon Vet.
    Lucky Dog Films
  • California:  Alcatraz Prison. This image is from Drain Alcatraz. [Photo of the day - December 2017]
    California: Alcatraz Prison. This image is from Drain Alcatraz.
    Northern Sky Entertainment/Crispin Sadler
  • Titanic in Belfast. This image is from Titanic's Fatal Fire. [Photo of the day - December 2017]
    Titanic in Belfast. This image is from Titanic's Fatal Fire.
    Steve Raffled
  • Yukon Territory, Canada:  Sheep at Honey Hill Farm. This image is from Dr. Oakley: Yukon Vet. [Photo of the day - December 2017]
    Yukon Territory, Canada: Sheep at Honey Hill Farm. This image is from Dr. Oakley: Yukon Vet.
    Lucky Dog Films/Mark Hendon
  • Dian Fossey plays with two young mountain gorillas in the wild. This image is from Dian Fossey:... [Photo of the day - December 2017]
    Dian Fossey plays with two young mountain gorillas in the wild. This image is from Dian Fossey: Secrets in the Mist.
    ROBERT I.M. CAMPBELL
  • Northern Territory, Australia:  Jono takes a moment to watch the setting sun. This image is from... [Photo of the day - December 2017]
    Northern Territory, Australia: Jono takes a moment to watch the setting sun. This image is from Monster Croc Wrangler.
    National Geographic/Daniel Walkington