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During the years 1974-1982 materials of 127 nests of various bird family taxons from several sites of Mongolia was obtained by members of former Soviet-Mongolian-Slovak expeditions. A total of 3211 flea individuals belonging to 22 taxons were gathered in 72 positive nests; 99.22% of obtained specimens represented taxons typical for birds, others were mammalian fleas. Frontopsylla cornuta Ioff, 1946 is a new species for area of Mongolia. Ceratophyllus maculatus Wagner, 1927 was eudominant species in nests of Hirundinidae family representants. The most frequent fleas were Ceratophyllus tribulis Jordan, 1926 and C. vagabundus (Boheman, 1865).