Starlings are small to medium-sized passerine birds in the family Sturnidae. The name "Sturnidae" comes from the Latin word for Starling, sturnus. Starlings occur naturally in the Old World, from Europe, Asia and Africa, to northern Australia and the islands of the tropical Pacific. Several European and Asian species have been introduced to these areas as well as North America, Hawaii and New Zealand, where they generally compete for habitat with native birds and are considered to be invasive species.
Starlings have strong feet, their flight is strong and direct, and they are very gregarious. Their preferred habitat is fairly open country, and they eat insects and fruit. Several species live around human habitation, and are effectively omnivores. Many species search for food by opening the bill after probing it into dense vegetation; this behavior is called "open-bill probing" or is referred to by the German word "zirkeln" (). Plumage is typically dark with a metallic sheen. Most species nest in holes, laying blue or white eggs.
The shortest-bodied species is Kenrick's Starling (Poeoptera kenricki), at 15 centimetres (6 in), but the lightest-weight species is Abbott's Starling (Poeoptera femoralis), at 34 grams (1.2 oz). The largest starlings are the mynas of the genus Mino, especially the Yellow-faced (Mino dumontii) and Long-tailed Mynas (Mino kreffti). These mynas can exceed 30 centimetres (1 ft) and weigh over 225 grams (8 oz).
Starlings have diverse and complex vocalizations, and have been known to imbed sounds from their surroundings into their own calls, including car alarms, and human speech patterns. The birds can recognize particular individuals by their calls, and are currently the subject of research into the evolution of human language.
The oxpeckers are sometimes placed here as a subfamily, but the weight of evidence has shifted towards granting them full family status as a more basal member of the Sturnidae-Mimidae group, derived from an early expansion into Africa.
Usually the starlings are considered a family, as is done here. Sibley & Monroe (1990) included the mimids in the family and demoted the starlings to tribe rank, as Sturnini. This treatment was used by Zuccon et al. (2006). However, the grouping of Sibley & Monroe (besides leaving the subfamily rank vacant) is overly coarse due to methodological drawbacks of their DNA-DNA hybridization technique and most of their proposed revisions of taxonomic rank have not been accepted (see for example Ciconiiformes). The all-inclusive Sturnidae grouping is all but noninformative as regards biogeography, and obscures the evolutionary distinctness of the three lineages. Establishing a valid name for the clade consisting of Sibley/Monroe's "pan-Sturnidae" would nonetheless be desirable to contrast them with the other major lineages of Muscicapoidea.
Starlings probably originated in the general area of the East Asia, perhaps towards the southwestern Pacific, as evidenced by the number of plesiomorphic lineages to occur there. Expansion into Africa appears to have occurred later, as most derived forms are found there. An alternative scenario would be African origin for the entire "sturnoid" (as per Zuccon et al. 2006) group, with the oxpeckers representing an ancient relict and the mimids arriving in South America. This is contradicted by the North American distribution of the most basal Mimidae.(Cibois & Cracraft 2004, Zuccon et al. 2006)
As the fossil record is limited to quite Recent forms, the proposed Early Miocene (about 25-20 mya) divergence dates for the "sturnoids" lineages must be considered extremely tentative. Given the overall evidence for origin of most Passeri families in the first half of the Miocene, it appears to be not too far off the mark however.(Zuccon et al. 2006) Recent studies (Cibois & Cracraft 2004, Zuccon et al. 2006) identified two major clades of this family, corresponding to the generally drab, often striped, largish "atypical mynas" and other mainly Asian-Pacific lineages, and the often smaller, sometimes highly apomorphic taxa which are most common in Africa and the Palearctic, usually have metallic coloration, and in a number of species also bright carotinoid plumage colors on the underside. Inside this latter group, there is a clade consisting of species which, again, are usually not too brightly-colored, and which consists of the "typical" myna-Sturnus assemblage.
Interestingly, the Philippine creepers, a single genus of 3 species of treecreeper-like birds appear to be highly apomorphic members of the more initial radiation of the Sturnidae (Zuccon et al. 2006). While this may seem odd ad first glance, their placement has always been contentious. In addition, biogeography virtually rules out a close relationship of Philippine creepers and treecreepers, as neither the latter nor their close relatives seem have ever reached the Wallacea, let alone the Philippines. Nonetheless, their inclusion in the Sturnidae is not entirely final and eventually they may remain a separate family.
Genus sequence follows traditional treatments. This is apparently not entirely correct, with Scissirostrum closer to Aplonis than to Gracula for example, and Acridotheres among the most advanced genera. Too few taxa have already been studied as regards their relationships however, and thus a change in sequence has to wait.
The review by Lovette & Rubenstein (2008) is the most recent work on the phylogeny of the group.
As the avifauna of the Mascarenes is predominantly of Indian origin though as old as to be highly distinct, it is not clear to which clade these starlings belong - or even if they are indeed starlings, as the Réunion Starling at least was highly aberrant and there have always been lingering doubts about whether they are correctly placed here.