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Zoo visitors were left stunned when a polar bear hunted down a duck and ate it after it landed in his enclosure.
The moment was captured by visitors on their mobile phones with footage showing a duck sitting on the water inside a polar bear enclosure before the beast strikes.
The unsuspecting duck lands on the pool not realising the danger and seconds later, a polar bear surfaces from the water and pounces on the duck from behind.
Visitors at the San Diego Zoo gasped as the polar bear trapped it in its jaw.