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Humpback whale 'Rio' swims through San Francisco Bay, spotted in Suisun Bay by USCG

Posted on September 22, 2026
By Bing News
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Humpback whale 'Rio' swims through San Francisco Bay, spotted in Suisun Bay by USCG

A humpback whale, identified as Rio, ventured far into California's Delta region, puzzling experts. Public urged to observe respectfully from a distance.