Experts believe they could one day be marketed as a healthy alternative to fatty snacks. In most of Europe, bug-eating is largely restricted to the belated realisation that there has been an unwelcome addition to the salad. It is common elsewhere, however, with some 1,700 species of bug eaten in 113 countries. In Taiwan, stir-fried crickets or sauteed caterpillars are delicacies. A plate of maguey worms - larvae of a giant butterfly - sells for £12.50 in smart Mexican restaurants. Sago grubs wrapped in banana leaves go down well in Papua New Guinea, as does dragonfly in Bali. In many...