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PHILADELPHIA (CBS) — One of the peacocks that escaped from the Philadelphia Zoo has been found dead as the search continues for the other three birds on the loose.

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The zoo says one of the peacocks was found dead, most likely due to getting hit by a vehicle. The remaining three peacocks have not yet been found.

The peacocks caused traffic delays on I-76 before eventually hopping off the highway on Wednesday night.

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The zoo is asking people not to approach the peacocks because they may be nervous being out of their normal environment.

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The peacocks are known for roaming freely around the Philadelphia Zoo.