Note: "Neglected clades"

Avian phylogeny in general is well investigated and some clades have received particular attention, e.g. Galliformes, Coraciiformes, Trogoniformes and several families of Passeriformes. However, a number of clades have received no or little attention. Therefore, I included this chapter hoping to direct future research efforts towards the following clades: 

Category 0 (no DNA data)

Category 1 (sparse DNA data, poor coverage, or theses only)