Unknown: The cassowary is a large, flightless bird most closely related to the emu. Cassowary's are generally jet black as adults, but the fabulous skin colors on their faces and neck vary according to species and location. This image is from Badass Animals.
Wild Spirit Wolf Sanctuary, New Mexico, USA: The uniquely penetrating stare of a hybrid wolf-dog, peers directly into the lens at the Wild Spirit Wolf Sanctuary in New Mexico. This image is from America The Wild.
Wohlthat Mountains, Antarctica: Mike Libecki and Freddie Wilkinson walk across vast ancient glacial ice in the Wohlthat range. Because the katabatic winds were so strong and had blown the ice free of snow, the team could no longer ski but were forced to use crampons on their boots to walk and drag their sleds during much of the circumnavigation. This image is from National Geographic Photographers: The Best Job in the World.