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Regulidae (kinglets, titwarblers; class Aves, order Passeriformes) A family of tiny, loose-feathered birds which have pointed bills and short to medium-length tails. Regulus species (kinglets) are mainly green above, and buff below, with bright orange, yellow, or red crown patches, and inhabit coniferous woodland. Leptopoecile species (titwarblers) are multicoloured, the females being duller than males, and inhabit scrub and heathland. Members of both genera are insectivorous and nest in trees or bushes. There are two genera, with seven species, often placed in Sylviidae, found in Europe, Asia, and N. America.