Elspode and And suggested this one. It's been pretty widely circulated, but it's such a nice Friday image -- only bettered by yesterday's ostrich.
Pelusa, a fourteen-year-old female polar bear, looks through the bars of her cage at Mendoza's Zoo, some 1,200 kilometers (750 miles) west of Buenos Aires, Argentina.
Pelusa is normally white, but turned this color after vets gave her a drug to fight a skin infection. She should turn back to her normal color within a month.