On Tuesday, officials found 20 to 30 pilot whales either beached or stranded in waters in a remote area of the park near Highland Beach in northern Monroe County.
Rangers helped some of the whales, but about 10 were beached late Tuesday.
Park spokeswoman Linda Friar says six of the whales were pushed back into the water, but four died.
She says park rangers, along with crews from the Florida Fish and Wildlife Conservation Commission and the National Oceanic and Atmospheric Administration, will help the whales again Wednesday.
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