More than 17 million arthropods cross every year through Bujaruelo pass in the Pyrenees mountains, with up to 3,000 flies per meter and minute on some days, making it a significant migration route.
The Bujaruelo pass is a crucial route for flying insects to travel through the high Pyrenees, although there are likely many more similar passes facilitating insect migrations across the mountains.
The first recorded case of fly migration in Europe was at the Bujaruelo pass in 1950, with various species like Episyrphus balteatus, butterflies, and dragonflies observed during the migration.
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