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The article presents a study which investigates the implications on aging rusty blackbirds of the prebasic and previously undescribed prealternate molt at Whitehorse, Yukon Territory. It says that a Friedman test was used in the study to compare molt intensity in feather and a Kruskal-Wallis test to test the molt intensity variation of the aging rusty blackbirds. The result of the study shows that presence of the pale-eye ring can be used to identify the age of aging birds along with the chin.

The article presents a study which investigates regarding the incidence of hematozoa infections in wintering and breeding Rusty Blackbirds (Euphagus carolinus) in different times of the year. It states that the differences of prevalence and the comparison of prevalence of hematozoa between Alaska and Maine was analyzed using the chi-squared test. The result of the study shows that a nonseasonal relapse was suggested in overwintering Rusty Blackbirds for the high prevalence of hematozoans.

The article offers a study on the geographical and seasonal differences in the levels of mercury concentrations in the blood and feathers of rusty blackbirds (Euphagus carolinus) in several North American regions. It says that mercury concentrations in bloods and feathers of birds in Acadian forests were higher than those of the western boreal forests of Alaska and wintering areas in the U.S. Moreover, it states that wintering birds have lower blood mercury levels than those of breeding birds.

The article offers a study on stable hydrogen isotopes in feathers of rusty blackbirds (Euphagus carolinus) in Mississippi Alluvial Valley and coastal South Carolina and Virginia, and in museum specimens from 1879 to 1990 to determine a migratory connectivity. It says that modern and historical isotopic analyses show a difference in the breeding origins of birds wintering in those regions. Moreover, it suggests that wildlife management should be tailored on both breeding and wintering grounds.