With Subtree of Life you can find relationships between species:
... and publishes references to the literature backing a relationship.
This is important since the tree you get can vary even depending on the gene you study, which can raise some questions about how to interpret these trees.
The relationships are obtained from opentreeoflife.org.
https://sol.vandenoever.info/?uids=695336,1093902
When another bird species is added, one more closest common ancestor pops up: