'The famous sea lions of San Francisco's Fisherman's Wharf have disappeared after 20 years — leaving experts baffled as to why.
Last month, Pier 39 groaned under the weight of some 1,500 of the animals. But now all but a few have swum off bringing to an end a two-decade long sojourn — and one of the world's smelliest tourist attractions.
My theory is that they just hate parties."
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