Starlings are small to medium-sized birds that have a cosmopolitan distribution. Hybridization has been recorded in a few genera, Mino, Sturnus and Lamprotornis.
Common Starling (S. vulgaris) and Spotless Starling (S. unicolor) are known to interbreed (Motis, 1992). Based on allozymes, the gene flow between these species was estimated at six migrants per generation (delaCruzCardiel et al., 1997).
delaCruzCardiel, P. J., Deceuninck, B., Peris, S. J. & ElenaRossello, J. A. (1997). Allozyme polymorphism and interspecific relationships in the Common starling (Sturnus vulgaris) and Spotless starling (S-unicolor) (Aves: Sturnidae). Journal of Zoological Systematics and Evolutionary Research 35, 75-79.
Motis, A. (1992). Mixed breeding pairs of European Starling (Sturnus vulgaris) and Spotless starling (Sturnus unicolor) in the north-east of Spain. Butlletí del Grup Catalá d’Anellament, 19-23.