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Flying insects speak of long distance migration as in every autumn a tranquil mountain pass in the Swiss Alps transforms into an insect superhighway. The air coagulates as millions of migrating flies, moths and butterflies pave their way through an attenuated opening in the mountains. Menz, an ecologist at the University of Bern in Switzerland, leads an international team of scientists who plummet on the pass for a few months each year. In the day, they switch on radar instruments and increase webbed nets to trace and seize some of the insects buzzing south. In the evening they burst out drinks and snacks and anticipate for night loving life to arrive. That’s when they entice extensive furry moths from the firmament into sampling nets gashing them like salmon from a stream.

Menz is in love with landscape and the science. This pass known as the Col de Bretolet, is an epochal pasture among European ecologists. For decades ornithologists have traced birds wandering through. Menz is carrying out the same kind of tracing but this time he is keen on insects on which the birds feed.

Migrating insects, like the ones that are vibrant through the Swiss mountain pass offer vital ecosystem services. They pollinate harvest and wild plants and eat agricultural insects. Dara Satterfield, an ecologist at the Smithsonian Institution in Washington, D.C. said that there are trillions of insects globally that migrate every year and this is just the starting of comprehending links to ecosystem and humanity.