The Associated Press has a story about green polar bears in Japan:
Three normally white polar bears at Higashiyama Zoo and Botanical Gardens in central Japan changed their color in July after swimming in a pond with an overgrowth of algae. The Associated Press [^].
Japanese Green Polar Bear
The algae that turns the bears green grows inside of the outer hollow guard hairs, making it extremely hard to treat. The best treatment is to wait for colder weather and the algae dies, and the bear eventually turns white again. This is an unusual situation but not completely unheard of, it has happened before in Singapore in 2004 [^], and San Diego in 1979.
Photo Credit: Associated Press
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