Many hundreds of adults flying over the Tajo river and around the bridge where are the old and new nests.
CitationPierandrea Brichetti, IBC1231899. Accessible at hbw.com/ibc/1231899.
Pierandrea Brichetti, IBC1231899. Video of Northern House Martin Delichon urbicum at El Puente del Arzobispo, Spain. Accessible at hbw.com/ibc/1231899.
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