By Helen Briggs
Science reporter, BBC News, Boston
Over-fishing and demand for shark fins, an expensive delicacy, have pushed one of the world's iconic animals towards the brink of extinction, say experts.
The scalloped hammerhead shark is to be added to the official endangered species list this year, under the heading "globally endangered".
Their plight has been discussed at the American Association for the Advancement of Science annual meeting.
It was told that enforcement of marine reserves would aid shark protection.
The observation takes account of new research that shows hammerhead and great white sharks patrol fixed routes in the ocean, gathering at hotspots to mate or feed.
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http://news.bbc.co.uk/2/hi/science/nature/7251651.stm