Black Bear in the Sierra Mountains

Black Bear (Ursus americanus) in the California Sierra Mountains

Red Fox in Denali National Park

Red Fox (Vulpes vulpes) in Denali National Park, Alaska

Brown Bear Cub

Brown bear (Ursus arctos) cub stands up on hind legs in Alaska

Weddell Seal in Antarctica

Weddell Seal (Leptonychotes weddellii) in Antarctica

Antarctic Sunset

Sunset in Antarctica

Antarctic Iceberg

Iceberg in Antarctica

Gentoo Penguin Catching Snowflakes

Gentoo Penguin (Pygoscelis papua) catching snowflakes

Elephant Seal in Antarctica

Southern Elephant Seal (Mirounga leonina) in Antarctica

National Geographic Explorer in Antarctica

The M/V National Geographic Explorer in Antarctica