New report of the monitoring and wintering of the Red Kite in the Burgos province. (Pdf file)
Probably a few birds start the migration towards to the north, and probably, these birds though be a part of roosting in Navarra and France.
This gives us an idea of the complicated thing that it is to realise a correct census of these birds, though at the outset, seems easy.
Congratulations to the participants.