Starlings and mynas (the two terms are sometimes interchangeable and have little or no taxonomic significance) are gregarious birds, typically medium-sized with straight or slightly down-curved bills of a moderate length, and dark plumages with an iridescent sheen. Several species, the mynas in particular, are well-known mimics. Some species have wattles or patches of bare skin around the eyes, a few species have crests or long tail feathers, and the glossy starlings (genus Lamprotornis) are especially brightly coloured. The Sturnidae family is native to Africa and Eurasia, though Common Starling Sturnus vulgaris and Common Myna Acridotheres tristis have been introduced to North America and New Zealand, among other areas, where they are often considered invasive species.