See text Ergaticus Baird (1865) Cardellina is a genus of passerine birds in the New World warbler family Parulidae.

A comprehensive study of the wood-warblers published in 2010 that analysed mitochondrial and nuclear DNA sequences found that the five species formed a discrete clade, with the Wilson's and Canada warblers as early offshoots, followed by a lineage that gave rise to two branches – one leading to the red-faced and another that diverged to the red and pink-headed warblers.

[8] Recent DNA analysis shows that Ergaticus falls comfortably within the New World warbler clade, along with 18 other genera.

The pink-headed warbler, C. versicolor, is found south of the isthmus, in the highlands of Chiapas, Mexico and western Guatemala.

[11] As adults, their overall color is red, with duller wings and tails; juveniles are tawny-brown, with slightly paler underparts.