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Eco-photos of the week: March 20-26

March 25, 2011, 8:52 a.m.
Gregor, a young polar bear cub, swims inside his enclosure at the tiergarten Zoo in Nuremburg, Germany on March 23.

Photo: Daniel Karmann

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Polar bear plunge

Gregor, a young polar bear cub, swims inside his enclosure at the Tiergarten Zoo in Nuremburg, Germany on March 23.

Gregor and his sister, Aleut, were born on Dec. 16 and just recently left their breeding burrow for the first time.