An adult collecting mud for nest building.
CitationPierandrea Brichetti, IBC1219760. Accessible at hbw.com/ibc/1219760.
Pierandrea Brichetti, IBC1219760. Video of Eurasian Crag Martin Ptyonoprogne rupestris at Monfragüe National Park, Spain. Accessible at hbw.com/ibc/1219760.
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