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A two-day-old baby elephant named 'Jamuna Toni' investigates her enclosure at Hellabrunn Zoo in the southern German city of Munich on December 23, 2009. The Asian elephant baby was born on December 21, 2009. AFP PHOTO DDP / JOERG KOCH GERMANY OUT (Photo credit should read JOERG KOCH/AFP/Getty Images)
A two-day-old baby elephant named 'Jamuna Toni' investigates her enclosure at Hellabrunn Zoo in the southern German city of Munich on December 23, 2009. The Asian elephant baby was born on December 21, 2009. AFP PHOTO DDP / JOERG KOCH GERMANY OUT (Photo credit should read JOERG KOCH/AFP/Getty Images)

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    Munich Zoo's elephant energy

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Munich Zoo's elephant energy

CNN's Nick Glass visits Munich Zoo where the elephants are doing their bit to power the attraction.

Munich Zoo's elephant energy

CNN's Nick Glass visits Munich Zoo where the elephants are doing their bit to power the attraction.