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House martin (Delichon urbica) and swallow (Hirundo rustica) collecting mud to build nest. House martin have collected some fish eggs.  <br />
Delta of the Neretva river (trans-boundary area Croatia-Bosnia-Herzegovina/Croatia), eastern coast of the Adriatic sea, Dalmatia region, Croatia. <br />
May 2009. <br />
Elio della Ferrera / Wild Wonders of Europe