Adult starling males and females mature to a length of about 21.5 centimeters (8.5 inches) and weigh between 2.5 and 3.5 ounces. Both males and females have similar iridescent green glossed feathers covering the back, nape, and breast. The black wings are occasionally seen with a veneer of green and purple. In winter when the tips of the feathers have eroded away, a white or cream colored "flecking" appears against a dusky black background, primarily on the breast. This accounts for the non-breeding plumage of the adult birds. The shape of these feathers is rounded at the base and jagged toward the tip. Both sexes also share similarities in leg color (reddish brown), iris color (dark brown), and in the seasonal changes in bill color (yellow during mating season, otherwise black). Sexual dimorphism is also plentiful. Males have elongated feathers over the breast, whereas females have short and petite plumes. Males sport a bluish spot at the base of their beaks, while the female displays a reddish pink speck. In juvenile birds, the fine gloss is not as noticeable as in the adults. Juvenile birds also tend to have more rounded tips at their wings. And unlike the adult yellow bill, juveniles display a brownish-black shade year-round. (Craig and Feare 1999; "European Starling Facts" 2000; Weber 1980).
Range mass: 70.0 to 100.0 g.
Average length: 21.5 cm.
Average wingspan: 40.0 cm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: sexes alike
Average basal metabolic rate: 0.877 W.