It's not easy to like hammerhead sharks. Ugly to the point of freakishness, stupid beyond mere brutishness, the species is one of nature's least agreeable creations. Nonetheless it was bad news last week when the journal Science published a paper revealing that the unloved hammerhead, as well as many other species of shark, is vanishing faster than we imagined. If the beleaguered predators--consumed as delicacies, hunted as trophies and inadvertently caught by fishing fleets seeking other game--should ever disappear entirely, the world's oceans could be in serious trouble.
Biologist Ransom Myers of Dalhousie University in Nova Scotia led a team of...
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