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Leatherback sea turtles have been plying the world s oceans for tens of millions of years, but scientists say a rapid decline in their numbers means they could disappear from U.S. West Coast waters within decades. MONTEREY, Calif. — Scientists were documenting stranded sea turtles on California s beaches nearly 40 years ago when they noticed that leatherbacks — massive sea turtles that date to the time of the dinosaurs — were among those washing up on shore. It was strange because the nearest known population of the giants was several thousand miles away in the waters of Central and South America. Their mysterious presence led researchers to a startling discovery. A subset of leatherbacks that hatches on beaches in Indonesia, Papua New Guinea, Vanuatu and the Solomon Islands were migrating 7,000 miles across the Pacific Ocean to the cold waters off the U.S. West Coast, where they gorged on jellyfish before swimming back. The epic journey stunned scientists.

United statesSan jose state universityUnited kingdomPapua new guineaSolomon islandsDaniel paulyScott bensonJim harveyPacific oceanAtmospheric administrationNational oceanicUniversity of british columbiaMoss landing marine laboratoriesBritish columbiaஒன்றுபட்டது மாநிலங்களில்சான் ஜோசே நிலை பல்கலைக்கழகம்