It is a weird and wonderful sight: millions of migratory insects funnelling through a single narrow pass high in the Pyrenees, looking like a dark flying carpet and emitting a low, deep hum.
Not only were vast numbers of marmalade hoverflies still migrating through the pass but far more besides. These insects would have begun their journeys farther north in Europe and continued south into Spain and perhaps beyond for the winter.
There has been an alarming decline in insect numbers across the globe and the assumption is that the amount travelling through the pass has dropped since the Lacks first observed it, though the precise figures were not recorded 70 years ago.
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