Polar bears turn green with algae

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Three polar bears at Nagoya zoo in central Japan turned green this summer from swimming in a pond infested with algae. The zoo staff had been changing the water less frequently to save resources, and the hot weather had induced algae overgrowth in the pond and safety moat. The same thing happened at Singapore Zoo four years ago, and at the San Diego Zoo back in 1979.

Algae-dyed polar bears puzzle Japan zoo visitors

( Lisa Katayama is a guest blogger.)