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Eco-photos of the week: July 31-Aug. 6

A pair of polar bears fight over an 'ice bomb' at the zoo in Hanover, Germany on Aug. 2.

Photo: Caroline Seidel

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Play-fighting polar bears

A pair of polar bears fight over an "ice bomb" at the zoo in Hanover, Germany, on Aug. 2.

To cool off during warm seasons, the polar bears get special treats that consist of fruit, grains, fish and oatmeal that are submerged in water and frozen.