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Gray Whales Enter San Francisco Bay More Often

Gray whales are entering San Francisco Bay in greater numbers and staying longer during their annual migration. Scientists link the change to climate conditions. Last year the Bay Area recorded its highest number of gray whale deaths in 25 years.

Associated Press
1 source·May 21, 9:14 PM(7 days ago)·1m read
Gray Whales Enter San Francisco Bay More Oftene360.yale.edu
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Gray whales have long migrated along the California coast on their roughly 12,000-mile (19,300-kilometer) journey between breeding lagoons in Mexico and feeding grounds in the Arctic. Instead of simply passing offshore, increasing numbers are now diverting into San Francisco Bay and lingering for days or even weeks inside the crowded estuary.

Scientists increasingly link the shift to climate change.

Last year, 21 dead gray whales were found in the wider Bay Area. The Marine Mammal Center reported that this was the highest number in 25 years. At least 40% of the deaths were caused by ship strikes.

Key Facts

12,000-mile migration
Journey between Mexico and Arctic feeding grounds
21 dead whales
Highest number in Bay Area in 25 years
40% ship strikes
Share of deaths attributed to vessel collisions

Potential Impact

  1. 01

    More frequent ship strikes may increase whale mortality in the Bay Area.

Transparency Panel

Sources cross-referenced1
Confidence score75%
Synthesized bySubstrate AI
Word count102 words
PublishedMay 21, 2026, 9:14 PM
Bias signals removed2 across 1 outlet
Signal Breakdown
Editorializing 1Loaded 1

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