幼年蝗虫相互蚕食的趋势是一种可能性.这一点也被认为是为什么它们会结队前进的原因.它们通过不断的运动以避免成为同伴的盘中餐,当然也成为了行进路线发生突然改变的一大诱因.

This is believed to be why they march in crowds. By keeping on the move they avoid becoming a meal for a neighbour—surely a powerful incentive for a sudden change of direction, too.

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但是数十辆火车改变了行进路线，造成大量延迟。

But dozens of trains were rerouted, causing massive delays.

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