The Global Raptor Information Network is a wonderful website by the Peregrine Fund about the raptors of the world. It has detailed species accounts for all raptor species covering distribution, taxonony, movements, feeding, conservation and more. Below the species accounts are important references and a list of researchers working with the species.
The species can be grouped and searched by different criteria like continents where they live, conservation status or population trend.
If you want to learn more about a certain raptor species or all the raptors on the continent you live, then a visit to the Global Raptor Information Network will give you a lot of information. A must read website for both professionals working for the conservationi of the various species and for every birder serious about raptors.