Green Polar Bears of Japanese Zoo.
Became green due to swimming in algea infested ponds. In July when the climate is hot and water in the pond in not changed regularly may cause growth of green algea.
As the white polar bear swim in the pond to cool down, its fur caught the algea by trapping the algea in the hollow part in the fur.
So the fur became green. The bear will shade off the green pigment when the weather is
cooler in September onwards.
Anyway, its nice to see green bears for a change.