To study the hoverflies in detail, the team used four high-speed digital video cameras to reconstruct the motion of approximately 22 points on each wing using photogrammetric techniques.

为了详细研究食蚜虻的飞行，该小组使用四部高速数字摄影机，利用摄影测量学技术来重构每个翼在大约 22 个位置点的动作。

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And that, according to Dr Edmunds's interpretation of previous studies of hoverflies, and also his own work on salticids, is what actually happens.

ECONOMIST: Insects and mimicry

But no such adaptive change is seen in collections of hoverflies made over the course of the past two centuries, suggesting that the imperfect mimics are stable in evolutionary terms.

ECONOMIST: Insects and mimicry