Nine, including the scalloped hammerhead, have been added or will be added this year.

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The scalloped hammerhead shark is to be added to the official endangered species list this year, under the heading "globally endangered".

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Tagging studies show that the scalloped hammerhead gathers at fixed sites around islands in the Eastern Pacific Ocean during its long-distance migrations.

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For many large coastal shark species, the drop in numbers was much greater: tiger, scalloped hammerhead and dusky shark populations have fallen by more than 95%.

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