After a month of absence in San Francisco, sea lions return to Pier 39. Rough Cut (no reporter narration).
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ROUGH CUT (NO REPORTER NARRATION)
A month after vanishing from San Francisco's Pier 39, sea lions have returned to the docks.
The animal hangout has been a hit for tourists since the sea lions arrived there in 1990.
In 2009, the sea lions also disappeared only to return three months later.
Marine experts have blamed breeding, feeding and construction projects as likely reasons for the periodic disappearances.
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