Birds Info contains all the resources and fact sheets we can gather about extant birds. There are so many that the list is hardly complete, but you can submit your own research articles to help out.
Exctinct Species is intended for the extinct birds & their relatives. Again, feel free to help us compile info sheets and share resources on the subject!
The Bestiaries section aims to provide basic information about mythical and supernatural bird creatures. However to read more about folklore and personal musings on the subject, you can go to Tales & Myths submenu.
Lastly, the Therian & ‘Kin page provides a list of therian and otherkin communities, personal websites and blogs that may be relevant to bird-people (also contains a selection of general therian and otherkin places).