icterids are unusual in songbirds because they have considerable sexual dimorphism. for example, the male great-tailed grackle is 60% heavier than the female. the smallest icterid species is the orchard oriole, in which the female averages 15 cm in length (6 in) and in weight, while the largest is the amazonian oropendola, the male of which measures and weighs about . this variation in size is greater than usual in passerine families.