Less than 100 years ago, the northern Elephant Seal was thought to be extinct.
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Many people thought it was too late.
Elephant seals were hunted to near extinction for their precious oil before the Mexican government stepped in to protect them.
Richards tells the story of their dramatic recovery.
In Return from Extinction: The Triumph of the Elephant Seal Linda L.
Today more than 250,000 Elephant seals swim in the Pacific Ocean from Alaska to Mexico.
Less than 100 years ago, the northern Elephant Seal was thought to be extinct