|Source Jarvis et al 2014|
Interesting evidence that many of the landlords we know of may have descended from the lineage of some sort of raptorial bird that lived through the asteroid impact that destroyed the rest of the dinosaurs--with one group evolving in Africa (Afroaves--woodpeckers, hawks, etc.) and another in Australia (Australaves--falcons, parrots, songbirds, etc.).
There's a lot to digest here, but it's definitely a golden age of bird taxonomy with the technology we have now giving us a much better view than ever before of how our world came to be inhabited by our feathered friends (and everything else, for that matter!).