Cold stress accounts for at least 39 of the deaths, or about 10%. For 277 others, almost 70%, the cause is unknown. Biologist suspect the sea cows are starving to death as the marine mammal’s main diet of seagrass wilts under ongoing years-long ecological collapse, driven by excess algae.
The population of endangered killer whales has hit a 30-year-low, numbering only 75 this year.
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