An recent article about Northern Shrikes Lanius borealis sibiricus
authors: Svetlana U. Tajkova & Âroslav A. Red’kin
Only museum skins of adults and first-year birds which completed postjuvenile molting, were used for comparisons. Overall, 515 collection specimens were studied, including 58 specimens of L. b. sibiricus, 282 specimens of L. e. excubitor from Europe, as well as 69 specimens of L. e. leucopterus from south-western Siberia and Kazakhstan. Color of fresh (autumn-winter) plumages was studied in 37 specimens of L. b. sibiricus and 198 specimens of L. excubitor.
Seven specimens of L. b. sibiricus collected in the territory of Ukraine in 1911-1941 were found in the collections.