If the trucks go off their set course, the horn sounds, hazard lights are activated and eventually, the truck will come to a standstill.

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The heavy-set writer in the horn-rimmed glasses teamed up on television with Gene Siskel to create a format for criticism that proved enormously appealing in its simplicity: uncomplicated reviews that were both intelligent and accessible and didn't talk down to ordinary movie fans.

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If the trade were legal, Campfire Zimbabwe says, it would give power to countries with rhinos to set appropriate conditions to the sale - for example insisting that the horn not be used for medicinal purposes or perhaps to get clarity on what markets use the horns.

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At one time, conservation rows set poor Africans, who needed the money from the ivory or rhino horn, against the sentimental sensitivities and big bucks of the animal-rights organisations of the rich West.

ECONOMIST: Tusks and horns and conservationists | The