The marmalade hoverflies, butterflies, and countless insects migrate southward for the winter, navigating the Bujaruelo Pass with its unique challenges.
On busy migration days, marmalade hoverflies produce a determined hum as they push through the pass's harsh conditions to reach warmer regions.
First recorded in 1950, the spectacular insect migration through the Pyrenees pass was revitalized by researchers in 2018 after nearly 70 years of no studies.
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