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Davvero potrebbero essere? C'erano molte rondini comuni che volavano in circolo in quel momento https://www.inaturalist.org/observations/133587232, come fanno di solito da fine agosto per preparare la migrazione, ma dopo aver rivisto le foto, questi due mi sembrano più simili a rondoni maggiori, anche se non parevano così grossi.
Could they really be? There were a lot of common Barn Swallows flying around, as they usually do from the end of August to prepare migration https://www.inaturalist.org/observations/133587232, but after I revised my photos, I saw these two look more like Alpine Swifts, even if they did not seem to be as large.