He is a laureate of the State Prize of Ukraine in the field of science and technology (2015),[1] and the author of more than 500 scientific publications.

[2] I. Zagorodniuk started his zoological research in ornithology when he was a student of Taras Shevchenko National University of Kyiv.

This investigations were shifted from a description of small taxa to the group analysis and the discovery of patterns of formation and existence of low and high levels of taxonomic diversity.

In the publications by I. Zagorodniuk a number of specifications are proposed regarding the interpretation of ranks and scopes of superfamily groups of mammals and unified names of some other taxa.

[13] I. V. Zagorodniuk is the initiator of the establishment and the founder of Theriological school — annual gathering of theriologists taking place in different regions of Ukraine since 1993.