National GeographicNat Geo Wild
  • Clewiston, FL  USA: American bison at Billie Swamp Safari. This image is from Swamp Men. [Photo of the day - May 2013]
    Clewiston, FL USA: American bison at Billie Swamp Safari. This image is from Swamp Men.
    Spectrum Field Productions, LLC
  • Denali National Park, Alaska, USA: An Artic ground squirrel fattens up for the winter in Denali... [Photo of the day - May 2013]
    Denali National Park, Alaska, USA: An Artic ground squirrel fattens up for the winter in Denali National Park. This image is from Bear Nomad.
    WNET and Nimmida Pontecorvo
  • Alaskan Peninsula, USA: A bear walks down to graze after coming down from the bluff.  This image... [Photo of the day - May 2013]
    Alaskan Peninsula, USA: A bear walks down to graze after coming down from the bluff. This image is from Bear Nomad.
    WNET and Chris Morgan