the superfamily sylvioidea was first proposed in 1990 in the sibley–ahlquist taxonomy of birds based on dna–dna hybridization experiments. more recent studies based on comparison of dna sequences have failed to support the inclusion of some families such as certhiidae (treecreepers), sittidae (nuthatches), paridae (tits and chickadees) and regulidae (goldcrests and kinglets) but instead support the addition of alaudidae (larks).