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The kinglets or crests are small birds in the family Regulidae. Species in this family were formerly classified with the Old World warblers. "Regulidae" is derived from the Latin word regulus, diminutive for "king", and refers to the coloured crowns of adult birds. This family has representatives in Eurasia and North America. There are six species in this family; one, the Madeira firecrest (Regulus madeirensis), was only recently split from the common firecrest as a separate species. The ruby-crowned kinglet differs sufficiently in its voice and plumage to be afforded its own genus, Corthylio.