The bird is signalling his territory. They do this during their breeding season. He may not return because I don't think the noise coming from the aluminum of an Airstream gives the desired effect like a metal transformer or chimney cap. Not sure there's a way to fix it without getting to the back side of the panel to try to push out the divots. Might be easier (and cheaper) to learn to live with this 'battle scar'.
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Cameron & the Labradors, Kai & Samm
North Vancouver, BC
Live! Life's a banquet and most poor suckers are starving to death! - Mame Dennis
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