The New World warblers (or wood-warblers) are small passerines, with short, slender bills. They are not closely related to the Old World warblers (formerly Sylviidae, now split into several families) or Australian warblers (Acanthizidae). The family gets its name from Northern Parula, a blue-and-yellow bird that Linnaeus mistakenly classified as a tit (Paridae). Unlike most of their European counterparts, the New World warblers are often brightly and distinctively coloured. Migratory members of this family are much sought-after as rarities in Europe, though transatlantic vagrants are often inexperienced first-winter birds, whose duller plumages can present an identification challenge. Vagrants aside, the family is restricted to North and northern South America, with the greatest diversity in Central America.