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I saw this mass today high in some trees in a nature reserve in Wiltshire.
I was told that this might be a mass of caterpillars of the brown winged moth - can anyone confirm or identify otherwise?
Thanks, no I didn't see any actual caterpillars, it was about 12 foot up in the tree.
Even zooming into the photo gives no detail. My book doesn't have brown winged moths - are they common?