`  ==Origin of birds sourcing== If you wanna start with adding adding refs, help yourself from . Though I didn't collect them for that article, there should be most of what's needed (they're for a future ``Origin of modern birds`` (or somesuch) article. Especially the van Tuinen et al (2006) and the Ericson + the other ``grandes`` (2006) papers should be good. Have still a few loose ends to tie up on the Passeriformes and hence haven't got to milk these refs... (  `