Blood parasites, body condition, and wing length in two subspecies of yellow wagtail (Motacilla flava) during migration
Blood parasites of migrating yellow wagtails of two subspecies-Motacilla flava feldegg and Motacilla flava flava-were studied on a sample of 473 birds caught in spring and autumn periods in Bulgaria. We controlled eight "migration waves" (flocks captured in different evenings) of yellow wagtails for four parameters-average body mass, average fat level, average wing length, and average prevalence o
