The bulky Arctic beasts - usually clad in a thick coat of snow-white hair - have started turning green.
A zoo spokesman ended speculation that the animals had been spray-painted in camouflage colours.
The green colouring is apparently the work of algae which have found a new home in the bears' translucent hair shafts.
"The harmless algae is the result of Singapore's warm and humid climate," spokesman Tan told the Press.
Two bears at the zoo have been afflicted by the algae so far - Sheba and her 13-year-old son, Inuka.
Sheba was treated first, the spokesman said.
Her coat was bleached with a hydrogen-peroxide solution a fortnight ago and is returning to its original colour.
Inuka has to endure the bright green splotches on its back, legs and ears until it is treated, too.
Polar-bear hairs usually appear white because they reflect the light around them.
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