Recycling

An Asian elephant eats a pine tree in her enclosure at Berlin's Zoologischer Garten zoo. The <a class="taxInlineTagLink" id="ANSP0000010" title="Elephant (animal)" href="/topic/science-technology/science/zoology/elephant-%28animal%29-ANSP0000010.topic">elephants</a> are fed pine trees discarded by Berlin residents after Christmas, once a year.

( AFP/Getty Images / January 13, 2012 )

An Asian elephant eats a pine tree in her enclosure at Berlin's Zoologischer Garten zoo. The elephants are fed pine trees discarded by Berlin residents after Christmas, once a year.

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