Why are grey whales dying in San Francisco's waters? US scientists search for clues
Summary
Many grey whales have been found dead or undernourished in San Francisco Bay, a place they usually do not stop during migration. Scientists say this may be due to less food caused by climate change, and many whales are also injured by ships.Key Facts
- In 2025, 21 dead grey whales were found in San Francisco Bay, with 7 deaths so far this year.
- Grey whales usually migrate between the Arctic and Baja California but have recently started stopping in the bay.
- Many of the whales found were skinnier than normal, lacking energy to complete their migration.
- Whales may enter the bay because their usual food in the Arctic is less available.
- Nearly 20% of the whales in the bay have died from ship strikes.
- Researchers studied photos and carcasses of whales in the bay since 2018.
- Dead whales are appearing earlier in the year than usual, which worries scientists.
- Necropsies (animal autopsies) are being done to understand the causes of death.
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