Birds (Aves) are the most numerous group of homeotherm vertebrates and they are hosts of many helminth parasites, a substantial part of them being nematodes. The authors summarise existing information about nematodes parasitizing in birds in the Czech and
the Slovak Republics. The checklist is based on a critical evaluation of data in the literature (more than 200 papers published during the period 1933-2010), but primary on extensive ﬁndings (partly unpublished) of the senior author (I. Sitko) obtained during his long-term (1962-2010) studies of the helminth parasites found in 14 135 birds of 235 species in the Czech Republic, especially in Central Moravia and South Bohemia.
A total of 152 nematode species is listed from birds in the Czech Republic (136 species, with 37 nematode taxa reported from the Czech Repubic for the ﬁrst time) and Slovak Republic (84 species), together with data on their deﬁnitive hosts, site of infection, records in the above-mentioned countries as well as basic information about their principal deﬁnitive hosts, zoogeographical distribution and life-cycles (if known).
This publication is intended for parasitologists, ornithologists, ichthyologists, biologists, veterinarians, workers in ﬁsheries, university students, for those who are engaged in nature conservation and for museologists. The checklist is compiled in English to be worldwide